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2683 lines
98 KiB
Python
2683 lines
98 KiB
Python
# Module doctest.
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# Released to the public domain 16-Jan-2001, by Tim Peters (tim@python.org).
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# Major enhancements and refactoring by:
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# Jim Fulton
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# Edward Loper
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# Provided as-is; use at your own risk; no warranty; no promises; enjoy!
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r"""Module doctest -- a framework for running examples in docstrings.
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In simplest use, end each module M to be tested with:
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def _test():
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import doctest
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doctest.testmod()
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if __name__ == "__main__":
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_test()
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Then running the module as a script will cause the examples in the
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docstrings to get executed and verified:
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python M.py
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This won't display anything unless an example fails, in which case the
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failing example(s) and the cause(s) of the failure(s) are printed to stdout
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(why not stderr? because stderr is a lame hack <0.2 wink>), and the final
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line of output is "Test failed.".
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Run it with the -v switch instead:
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python M.py -v
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and a detailed report of all examples tried is printed to stdout, along
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with assorted summaries at the end.
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You can force verbose mode by passing "verbose=True" to testmod, or prohibit
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it by passing "verbose=False". In either of those cases, sys.argv is not
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examined by testmod.
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There are a variety of other ways to run doctests, including integration
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with the unittest framework, and support for running non-Python text
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files containing doctests. There are also many ways to override parts
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of doctest's default behaviors. See the Library Reference Manual for
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details.
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"""
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__docformat__ = 'reStructuredText en'
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__all__ = [
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# 0, Option Flags
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'register_optionflag',
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'DONT_ACCEPT_TRUE_FOR_1',
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'DONT_ACCEPT_BLANKLINE',
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'NORMALIZE_WHITESPACE',
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'ELLIPSIS',
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'SKIP',
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'IGNORE_EXCEPTION_DETAIL',
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'COMPARISON_FLAGS',
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'REPORT_UDIFF',
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'REPORT_CDIFF',
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'REPORT_NDIFF',
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'REPORT_ONLY_FIRST_FAILURE',
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'REPORTING_FLAGS',
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# 1. Utility Functions
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# 2. Example & DocTest
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'Example',
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'DocTest',
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# 3. Doctest Parser
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'DocTestParser',
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# 4. Doctest Finder
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'DocTestFinder',
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# 5. Doctest Runner
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'DocTestRunner',
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'OutputChecker',
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'DocTestFailure',
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'UnexpectedException',
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'DebugRunner',
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# 6. Test Functions
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'testmod',
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'testfile',
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'run_docstring_examples',
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# 7. Unittest Support
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'DocTestSuite',
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'DocFileSuite',
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'set_unittest_reportflags',
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# 8. Debugging Support
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'script_from_examples',
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'testsource',
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'debug_src',
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'debug',
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]
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import __future__
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import sys, traceback, inspect, linecache, os, re
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import unittest, difflib, pdb, tempfile
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import warnings
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from io import StringIO
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from collections import namedtuple
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TestResults = namedtuple('TestResults', 'failed attempted')
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# There are 4 basic classes:
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# - Example: a <source, want> pair, plus an intra-docstring line number.
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# - DocTest: a collection of examples, parsed from a docstring, plus
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# info about where the docstring came from (name, filename, lineno).
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# - DocTestFinder: extracts DocTests from a given object's docstring and
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# its contained objects' docstrings.
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# - DocTestRunner: runs DocTest cases, and accumulates statistics.
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#
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# So the basic picture is:
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#
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# list of:
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# +------+ +---------+ +-------+
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# |object| --DocTestFinder-> | DocTest | --DocTestRunner-> |results|
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# +------+ +---------+ +-------+
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# | Example |
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# | ... |
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# | Example |
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# +---------+
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# Option constants.
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OPTIONFLAGS_BY_NAME = {}
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def register_optionflag(name):
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# Create a new flag unless `name` is already known.
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return OPTIONFLAGS_BY_NAME.setdefault(name, 1 << len(OPTIONFLAGS_BY_NAME))
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DONT_ACCEPT_TRUE_FOR_1 = register_optionflag('DONT_ACCEPT_TRUE_FOR_1')
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DONT_ACCEPT_BLANKLINE = register_optionflag('DONT_ACCEPT_BLANKLINE')
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NORMALIZE_WHITESPACE = register_optionflag('NORMALIZE_WHITESPACE')
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ELLIPSIS = register_optionflag('ELLIPSIS')
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SKIP = register_optionflag('SKIP')
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IGNORE_EXCEPTION_DETAIL = register_optionflag('IGNORE_EXCEPTION_DETAIL')
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COMPARISON_FLAGS = (DONT_ACCEPT_TRUE_FOR_1 |
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DONT_ACCEPT_BLANKLINE |
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NORMALIZE_WHITESPACE |
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ELLIPSIS |
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SKIP |
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IGNORE_EXCEPTION_DETAIL)
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REPORT_UDIFF = register_optionflag('REPORT_UDIFF')
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REPORT_CDIFF = register_optionflag('REPORT_CDIFF')
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REPORT_NDIFF = register_optionflag('REPORT_NDIFF')
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REPORT_ONLY_FIRST_FAILURE = register_optionflag('REPORT_ONLY_FIRST_FAILURE')
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REPORTING_FLAGS = (REPORT_UDIFF |
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REPORT_CDIFF |
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REPORT_NDIFF |
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REPORT_ONLY_FIRST_FAILURE)
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# Special string markers for use in `want` strings:
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BLANKLINE_MARKER = '<BLANKLINE>'
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ELLIPSIS_MARKER = '...'
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######################################################################
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## Table of Contents
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######################################################################
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# 1. Utility Functions
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# 2. Example & DocTest -- store test cases
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# 3. DocTest Parser -- extracts examples from strings
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# 4. DocTest Finder -- extracts test cases from objects
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# 5. DocTest Runner -- runs test cases
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# 6. Test Functions -- convenient wrappers for testing
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# 7. Unittest Support
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# 8. Debugging Support
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# 9. Example Usage
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######################################################################
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## 1. Utility Functions
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######################################################################
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def _extract_future_flags(globs):
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"""
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Return the compiler-flags associated with the future features that
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have been imported into the given namespace (globs).
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"""
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flags = 0
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for fname in __future__.all_feature_names:
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feature = globs.get(fname, None)
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if feature is getattr(__future__, fname):
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flags |= feature.compiler_flag
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return flags
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def _normalize_module(module, depth=2):
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"""
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Return the module specified by `module`. In particular:
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- If `module` is a module, then return module.
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- If `module` is a string, then import and return the
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module with that name.
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- If `module` is None, then return the calling module.
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The calling module is assumed to be the module of
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the stack frame at the given depth in the call stack.
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"""
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if inspect.ismodule(module):
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return module
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elif isinstance(module, str):
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return __import__(module, globals(), locals(), ["*"])
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elif module is None:
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return sys.modules[sys._getframe(depth).f_globals['__name__']]
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else:
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raise TypeError("Expected a module, string, or None")
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def _load_testfile(filename, package, module_relative, encoding):
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if module_relative:
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package = _normalize_module(package, 3)
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filename = _module_relative_path(package, filename)
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if hasattr(package, '__loader__'):
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if hasattr(package.__loader__, 'get_data'):
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file_contents = package.__loader__.get_data(filename)
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file_contents = file_contents.decode(encoding)
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# get_data() opens files as 'rb', so one must do the equivalent
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# conversion as universal newlines would do.
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return file_contents.replace(os.linesep, '\n'), filename
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with open(filename, encoding=encoding) as f:
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return f.read(), filename
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def _indent(s, indent=4):
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"""
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Add the given number of space characters to the beginning of
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every non-blank line in `s`, and return the result.
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"""
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# This regexp matches the start of non-blank lines:
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return re.sub('(?m)^(?!$)', indent*' ', s)
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def _exception_traceback(exc_info):
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"""
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Return a string containing a traceback message for the given
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exc_info tuple (as returned by sys.exc_info()).
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"""
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# Get a traceback message.
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excout = StringIO()
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exc_type, exc_val, exc_tb = exc_info
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traceback.print_exception(exc_type, exc_val, exc_tb, file=excout)
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return excout.getvalue()
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# Override some StringIO methods.
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class _SpoofOut(StringIO):
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def getvalue(self):
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result = StringIO.getvalue(self)
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# If anything at all was written, make sure there's a trailing
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# newline. There's no way for the expected output to indicate
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# that a trailing newline is missing.
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if result and not result.endswith("\n"):
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result += "\n"
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return result
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def truncate(self, size=None):
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self.seek(size)
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StringIO.truncate(self)
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# Worst-case linear-time ellipsis matching.
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def _ellipsis_match(want, got):
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"""
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Essentially the only subtle case:
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>>> _ellipsis_match('aa...aa', 'aaa')
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False
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"""
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if ELLIPSIS_MARKER not in want:
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return want == got
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# Find "the real" strings.
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ws = want.split(ELLIPSIS_MARKER)
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assert len(ws) >= 2
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# Deal with exact matches possibly needed at one or both ends.
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startpos, endpos = 0, len(got)
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w = ws[0]
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if w: # starts with exact match
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if got.startswith(w):
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startpos = len(w)
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del ws[0]
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else:
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return False
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w = ws[-1]
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if w: # ends with exact match
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if got.endswith(w):
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endpos -= len(w)
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del ws[-1]
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else:
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return False
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if startpos > endpos:
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# Exact end matches required more characters than we have, as in
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# _ellipsis_match('aa...aa', 'aaa')
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return False
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# For the rest, we only need to find the leftmost non-overlapping
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# match for each piece. If there's no overall match that way alone,
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# there's no overall match period.
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for w in ws:
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# w may be '' at times, if there are consecutive ellipses, or
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# due to an ellipsis at the start or end of `want`. That's OK.
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# Search for an empty string succeeds, and doesn't change startpos.
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startpos = got.find(w, startpos, endpos)
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if startpos < 0:
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return False
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startpos += len(w)
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return True
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def _comment_line(line):
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"Return a commented form of the given line"
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line = line.rstrip()
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if line:
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return '# '+line
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else:
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return '#'
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class _OutputRedirectingPdb(pdb.Pdb):
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"""
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A specialized version of the python debugger that redirects stdout
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to a given stream when interacting with the user. Stdout is *not*
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redirected when traced code is executed.
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"""
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def __init__(self, out):
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self.__out = out
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self.__debugger_used = False
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# do not play signal games in the pdb
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pdb.Pdb.__init__(self, stdout=out, nosigint=True)
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# still use input() to get user input
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self.use_rawinput = 1
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def set_trace(self, frame=None):
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self.__debugger_used = True
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if frame is None:
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frame = sys._getframe().f_back
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pdb.Pdb.set_trace(self, frame)
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def set_continue(self):
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# Calling set_continue unconditionally would break unit test
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# coverage reporting, as Bdb.set_continue calls sys.settrace(None).
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if self.__debugger_used:
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pdb.Pdb.set_continue(self)
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def trace_dispatch(self, *args):
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# Redirect stdout to the given stream.
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save_stdout = sys.stdout
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sys.stdout = self.__out
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# Call Pdb's trace dispatch method.
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try:
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return pdb.Pdb.trace_dispatch(self, *args)
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finally:
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sys.stdout = save_stdout
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# [XX] Normalize with respect to os.path.pardir?
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def _module_relative_path(module, path):
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if not inspect.ismodule(module):
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raise TypeError('Expected a module: %r' % module)
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if path.startswith('/'):
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raise ValueError('Module-relative files may not have absolute paths')
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# Find the base directory for the path.
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if hasattr(module, '__file__'):
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# A normal module/package
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basedir = os.path.split(module.__file__)[0]
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elif module.__name__ == '__main__':
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# An interactive session.
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if len(sys.argv)>0 and sys.argv[0] != '':
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basedir = os.path.split(sys.argv[0])[0]
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else:
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basedir = os.curdir
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else:
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# A module w/o __file__ (this includes builtins)
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raise ValueError("Can't resolve paths relative to the module " +
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module + " (it has no __file__)")
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# Combine the base directory and the path.
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return os.path.join(basedir, *(path.split('/')))
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######################################################################
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## 2. Example & DocTest
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######################################################################
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## - An "example" is a <source, want> pair, where "source" is a
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## fragment of source code, and "want" is the expected output for
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## "source." The Example class also includes information about
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## where the example was extracted from.
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##
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## - A "doctest" is a collection of examples, typically extracted from
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## a string (such as an object's docstring). The DocTest class also
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## includes information about where the string was extracted from.
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class Example:
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"""
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A single doctest example, consisting of source code and expected
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output. `Example` defines the following attributes:
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- source: A single Python statement, always ending with a newline.
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The constructor adds a newline if needed.
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- want: The expected output from running the source code (either
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from stdout, or a traceback in case of exception). `want` ends
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with a newline unless it's empty, in which case it's an empty
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string. The constructor adds a newline if needed.
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- exc_msg: The exception message generated by the example, if
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the example is expected to generate an exception; or `None` if
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it is not expected to generate an exception. This exception
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message is compared against the return value of
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`traceback.format_exception_only()`. `exc_msg` ends with a
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newline unless it's `None`. The constructor adds a newline
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if needed.
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- lineno: The line number within the DocTest string containing
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this Example where the Example begins. This line number is
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zero-based, with respect to the beginning of the DocTest.
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- indent: The example's indentation in the DocTest string.
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I.e., the number of space characters that preceed the
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example's first prompt.
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- options: A dictionary mapping from option flags to True or
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False, which is used to override default options for this
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example. Any option flags not contained in this dictionary
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are left at their default value (as specified by the
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DocTestRunner's optionflags). By default, no options are set.
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"""
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def __init__(self, source, want, exc_msg=None, lineno=0, indent=0,
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options=None):
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# Normalize inputs.
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if not source.endswith('\n'):
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source += '\n'
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if want and not want.endswith('\n'):
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want += '\n'
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if exc_msg is not None and not exc_msg.endswith('\n'):
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exc_msg += '\n'
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# Store properties.
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self.source = source
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self.want = want
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self.lineno = lineno
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self.indent = indent
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if options is None: options = {}
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self.options = options
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self.exc_msg = exc_msg
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class DocTest:
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"""
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A collection of doctest examples that should be run in a single
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namespace. Each `DocTest` defines the following attributes:
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- examples: the list of examples.
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- globs: The namespace (aka globals) that the examples should
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be run in.
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- name: A name identifying the DocTest (typically, the name of
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the object whose docstring this DocTest was extracted from).
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- filename: The name of the file that this DocTest was extracted
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from, or `None` if the filename is unknown.
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- lineno: The line number within filename where this DocTest
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begins, or `None` if the line number is unavailable. This
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line number is zero-based, with respect to the beginning of
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the file.
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- docstring: The string that the examples were extracted from,
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or `None` if the string is unavailable.
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"""
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def __init__(self, examples, globs, name, filename, lineno, docstring):
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"""
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Create a new DocTest containing the given examples. The
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DocTest's globals are initialized with a copy of `globs`.
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"""
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assert not isinstance(examples, str), \
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"DocTest no longer accepts str; use DocTestParser instead"
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self.examples = examples
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self.docstring = docstring
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self.globs = globs.copy()
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self.name = name
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self.filename = filename
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self.lineno = lineno
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def __repr__(self):
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if len(self.examples) == 0:
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examples = 'no examples'
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elif len(self.examples) == 1:
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examples = '1 example'
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else:
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examples = '%d examples' % len(self.examples)
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return ('<DocTest %s from %s:%s (%s)>' %
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(self.name, self.filename, self.lineno, examples))
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# This lets us sort tests by name:
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def __lt__(self, other):
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if not isinstance(other, DocTest):
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return NotImplemented
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return ((self.name, self.filename, self.lineno, id(self))
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<
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(other.name, other.filename, other.lineno, id(other)))
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######################################################################
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## 3. DocTestParser
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######################################################################
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class DocTestParser:
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"""
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A class used to parse strings containing doctest examples.
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"""
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# This regular expression is used to find doctest examples in a
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# string. It defines three groups: `source` is the source code
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# (including leading indentation and prompts); `indent` is the
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# indentation of the first (PS1) line of the source code; and
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# `want` is the expected output (including leading indentation).
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_EXAMPLE_RE = re.compile(r'''
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# Source consists of a PS1 line followed by zero or more PS2 lines.
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(?P<source>
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(?:^(?P<indent> [ ]*) >>> .*) # PS1 line
|
|
(?:\n [ ]* \.\.\. .*)*) # PS2 lines
|
|
\n?
|
|
# Want consists of any non-blank lines that do not start with PS1.
|
|
(?P<want> (?:(?![ ]*$) # Not a blank line
|
|
(?![ ]*>>>) # Not a line starting with PS1
|
|
.*$\n? # But any other line
|
|
)*)
|
|
''', re.MULTILINE | re.VERBOSE)
|
|
|
|
# A regular expression for handling `want` strings that contain
|
|
# expected exceptions. It divides `want` into three pieces:
|
|
# - the traceback header line (`hdr`)
|
|
# - the traceback stack (`stack`)
|
|
# - the exception message (`msg`), as generated by
|
|
# traceback.format_exception_only()
|
|
# `msg` may have multiple lines. We assume/require that the
|
|
# exception message is the first non-indented line starting with a word
|
|
# character following the traceback header line.
|
|
_EXCEPTION_RE = re.compile(r"""
|
|
# Grab the traceback header. Different versions of Python have
|
|
# said different things on the first traceback line.
|
|
^(?P<hdr> Traceback\ \(
|
|
(?: most\ recent\ call\ last
|
|
| innermost\ last
|
|
) \) :
|
|
)
|
|
\s* $ # toss trailing whitespace on the header.
|
|
(?P<stack> .*?) # don't blink: absorb stuff until...
|
|
^ (?P<msg> \w+ .*) # a line *starts* with alphanum.
|
|
""", re.VERBOSE | re.MULTILINE | re.DOTALL)
|
|
|
|
# A callable returning a true value iff its argument is a blank line
|
|
# or contains a single comment.
|
|
_IS_BLANK_OR_COMMENT = re.compile(r'^[ ]*(#.*)?$').match
|
|
|
|
def parse(self, string, name='<string>'):
|
|
"""
|
|
Divide the given string into examples and intervening text,
|
|
and return them as a list of alternating Examples and strings.
|
|
Line numbers for the Examples are 0-based. The optional
|
|
argument `name` is a name identifying this string, and is only
|
|
used for error messages.
|
|
"""
|
|
string = string.expandtabs()
|
|
# If all lines begin with the same indentation, then strip it.
|
|
min_indent = self._min_indent(string)
|
|
if min_indent > 0:
|
|
string = '\n'.join([l[min_indent:] for l in string.split('\n')])
|
|
|
|
output = []
|
|
charno, lineno = 0, 0
|
|
# Find all doctest examples in the string:
|
|
for m in self._EXAMPLE_RE.finditer(string):
|
|
# Add the pre-example text to `output`.
|
|
output.append(string[charno:m.start()])
|
|
# Update lineno (lines before this example)
|
|
lineno += string.count('\n', charno, m.start())
|
|
# Extract info from the regexp match.
|
|
(source, options, want, exc_msg) = \
|
|
self._parse_example(m, name, lineno)
|
|
# Create an Example, and add it to the list.
|
|
if not self._IS_BLANK_OR_COMMENT(source):
|
|
output.append( Example(source, want, exc_msg,
|
|
lineno=lineno,
|
|
indent=min_indent+len(m.group('indent')),
|
|
options=options) )
|
|
# Update lineno (lines inside this example)
|
|
lineno += string.count('\n', m.start(), m.end())
|
|
# Update charno.
|
|
charno = m.end()
|
|
# Add any remaining post-example text to `output`.
|
|
output.append(string[charno:])
|
|
return output
|
|
|
|
def get_doctest(self, string, globs, name, filename, lineno):
|
|
"""
|
|
Extract all doctest examples from the given string, and
|
|
collect them into a `DocTest` object.
|
|
|
|
`globs`, `name`, `filename`, and `lineno` are attributes for
|
|
the new `DocTest` object. See the documentation for `DocTest`
|
|
for more information.
|
|
"""
|
|
return DocTest(self.get_examples(string, name), globs,
|
|
name, filename, lineno, string)
|
|
|
|
def get_examples(self, string, name='<string>'):
|
|
"""
|
|
Extract all doctest examples from the given string, and return
|
|
them as a list of `Example` objects. Line numbers are
|
|
0-based, because it's most common in doctests that nothing
|
|
interesting appears on the same line as opening triple-quote,
|
|
and so the first interesting line is called \"line 1\" then.
|
|
|
|
The optional argument `name` is a name identifying this
|
|
string, and is only used for error messages.
|
|
"""
|
|
return [x for x in self.parse(string, name)
|
|
if isinstance(x, Example)]
|
|
|
|
def _parse_example(self, m, name, lineno):
|
|
"""
|
|
Given a regular expression match from `_EXAMPLE_RE` (`m`),
|
|
return a pair `(source, want)`, where `source` is the matched
|
|
example's source code (with prompts and indentation stripped);
|
|
and `want` is the example's expected output (with indentation
|
|
stripped).
|
|
|
|
`name` is the string's name, and `lineno` is the line number
|
|
where the example starts; both are used for error messages.
|
|
"""
|
|
# Get the example's indentation level.
|
|
indent = len(m.group('indent'))
|
|
|
|
# Divide source into lines; check that they're properly
|
|
# indented; and then strip their indentation & prompts.
|
|
source_lines = m.group('source').split('\n')
|
|
self._check_prompt_blank(source_lines, indent, name, lineno)
|
|
self._check_prefix(source_lines[1:], ' '*indent + '.', name, lineno)
|
|
source = '\n'.join([sl[indent+4:] for sl in source_lines])
|
|
|
|
# Divide want into lines; check that it's properly indented; and
|
|
# then strip the indentation. Spaces before the last newline should
|
|
# be preserved, so plain rstrip() isn't good enough.
|
|
want = m.group('want')
|
|
want_lines = want.split('\n')
|
|
if len(want_lines) > 1 and re.match(r' *$', want_lines[-1]):
|
|
del want_lines[-1] # forget final newline & spaces after it
|
|
self._check_prefix(want_lines, ' '*indent, name,
|
|
lineno + len(source_lines))
|
|
want = '\n'.join([wl[indent:] for wl in want_lines])
|
|
|
|
# If `want` contains a traceback message, then extract it.
|
|
m = self._EXCEPTION_RE.match(want)
|
|
if m:
|
|
exc_msg = m.group('msg')
|
|
else:
|
|
exc_msg = None
|
|
|
|
# Extract options from the source.
|
|
options = self._find_options(source, name, lineno)
|
|
|
|
return source, options, want, exc_msg
|
|
|
|
# This regular expression looks for option directives in the
|
|
# source code of an example. Option directives are comments
|
|
# starting with "doctest:". Warning: this may give false
|
|
# positives for string-literals that contain the string
|
|
# "#doctest:". Eliminating these false positives would require
|
|
# actually parsing the string; but we limit them by ignoring any
|
|
# line containing "#doctest:" that is *followed* by a quote mark.
|
|
_OPTION_DIRECTIVE_RE = re.compile(r'#\s*doctest:\s*([^\n\'"]*)$',
|
|
re.MULTILINE)
|
|
|
|
def _find_options(self, source, name, lineno):
|
|
"""
|
|
Return a dictionary containing option overrides extracted from
|
|
option directives in the given source string.
|
|
|
|
`name` is the string's name, and `lineno` is the line number
|
|
where the example starts; both are used for error messages.
|
|
"""
|
|
options = {}
|
|
# (note: with the current regexp, this will match at most once:)
|
|
for m in self._OPTION_DIRECTIVE_RE.finditer(source):
|
|
option_strings = m.group(1).replace(',', ' ').split()
|
|
for option in option_strings:
|
|
if (option[0] not in '+-' or
|
|
option[1:] not in OPTIONFLAGS_BY_NAME):
|
|
raise ValueError('line %r of the doctest for %s '
|
|
'has an invalid option: %r' %
|
|
(lineno+1, name, option))
|
|
flag = OPTIONFLAGS_BY_NAME[option[1:]]
|
|
options[flag] = (option[0] == '+')
|
|
if options and self._IS_BLANK_OR_COMMENT(source):
|
|
raise ValueError('line %r of the doctest for %s has an option '
|
|
'directive on a line with no example: %r' %
|
|
(lineno, name, source))
|
|
return options
|
|
|
|
# This regular expression finds the indentation of every non-blank
|
|
# line in a string.
|
|
_INDENT_RE = re.compile('^([ ]*)(?=\S)', re.MULTILINE)
|
|
|
|
def _min_indent(self, s):
|
|
"Return the minimum indentation of any non-blank line in `s`"
|
|
indents = [len(indent) for indent in self._INDENT_RE.findall(s)]
|
|
if len(indents) > 0:
|
|
return min(indents)
|
|
else:
|
|
return 0
|
|
|
|
def _check_prompt_blank(self, lines, indent, name, lineno):
|
|
"""
|
|
Given the lines of a source string (including prompts and
|
|
leading indentation), check to make sure that every prompt is
|
|
followed by a space character. If any line is not followed by
|
|
a space character, then raise ValueError.
|
|
"""
|
|
for i, line in enumerate(lines):
|
|
if len(line) >= indent+4 and line[indent+3] != ' ':
|
|
raise ValueError('line %r of the docstring for %s '
|
|
'lacks blank after %s: %r' %
|
|
(lineno+i+1, name,
|
|
line[indent:indent+3], line))
|
|
|
|
def _check_prefix(self, lines, prefix, name, lineno):
|
|
"""
|
|
Check that every line in the given list starts with the given
|
|
prefix; if any line does not, then raise a ValueError.
|
|
"""
|
|
for i, line in enumerate(lines):
|
|
if line and not line.startswith(prefix):
|
|
raise ValueError('line %r of the docstring for %s has '
|
|
'inconsistent leading whitespace: %r' %
|
|
(lineno+i+1, name, line))
|
|
|
|
|
|
######################################################################
|
|
## 4. DocTest Finder
|
|
######################################################################
|
|
|
|
class DocTestFinder:
|
|
"""
|
|
A class used to extract the DocTests that are relevant to a given
|
|
object, from its docstring and the docstrings of its contained
|
|
objects. Doctests can currently be extracted from the following
|
|
object types: modules, functions, classes, methods, staticmethods,
|
|
classmethods, and properties.
|
|
"""
|
|
|
|
def __init__(self, verbose=False, parser=DocTestParser(),
|
|
recurse=True, exclude_empty=True):
|
|
"""
|
|
Create a new doctest finder.
|
|
|
|
The optional argument `parser` specifies a class or
|
|
function that should be used to create new DocTest objects (or
|
|
objects that implement the same interface as DocTest). The
|
|
signature for this factory function should match the signature
|
|
of the DocTest constructor.
|
|
|
|
If the optional argument `recurse` is false, then `find` will
|
|
only examine the given object, and not any contained objects.
|
|
|
|
If the optional argument `exclude_empty` is false, then `find`
|
|
will include tests for objects with empty docstrings.
|
|
"""
|
|
self._parser = parser
|
|
self._verbose = verbose
|
|
self._recurse = recurse
|
|
self._exclude_empty = exclude_empty
|
|
|
|
def find(self, obj, name=None, module=None, globs=None, extraglobs=None):
|
|
"""
|
|
Return a list of the DocTests that are defined by the given
|
|
object's docstring, or by any of its contained objects'
|
|
docstrings.
|
|
|
|
The optional parameter `module` is the module that contains
|
|
the given object. If the module is not specified or is None, then
|
|
the test finder will attempt to automatically determine the
|
|
correct module. The object's module is used:
|
|
|
|
- As a default namespace, if `globs` is not specified.
|
|
- To prevent the DocTestFinder from extracting DocTests
|
|
from objects that are imported from other modules.
|
|
- To find the name of the file containing the object.
|
|
- To help find the line number of the object within its
|
|
file.
|
|
|
|
Contained objects whose module does not match `module` are ignored.
|
|
|
|
If `module` is False, no attempt to find the module will be made.
|
|
This is obscure, of use mostly in tests: if `module` is False, or
|
|
is None but cannot be found automatically, then all objects are
|
|
considered to belong to the (non-existent) module, so all contained
|
|
objects will (recursively) be searched for doctests.
|
|
|
|
The globals for each DocTest is formed by combining `globs`
|
|
and `extraglobs` (bindings in `extraglobs` override bindings
|
|
in `globs`). A new copy of the globals dictionary is created
|
|
for each DocTest. If `globs` is not specified, then it
|
|
defaults to the module's `__dict__`, if specified, or {}
|
|
otherwise. If `extraglobs` is not specified, then it defaults
|
|
to {}.
|
|
|
|
"""
|
|
# If name was not specified, then extract it from the object.
|
|
if name is None:
|
|
name = getattr(obj, '__name__', None)
|
|
if name is None:
|
|
raise ValueError("DocTestFinder.find: name must be given "
|
|
"when obj.__name__ doesn't exist: %r" %
|
|
(type(obj),))
|
|
|
|
# Find the module that contains the given object (if obj is
|
|
# a module, then module=obj.). Note: this may fail, in which
|
|
# case module will be None.
|
|
if module is False:
|
|
module = None
|
|
elif module is None:
|
|
module = inspect.getmodule(obj)
|
|
|
|
# Read the module's source code. This is used by
|
|
# DocTestFinder._find_lineno to find the line number for a
|
|
# given object's docstring.
|
|
try:
|
|
file = inspect.getsourcefile(obj)
|
|
except TypeError:
|
|
source_lines = None
|
|
else:
|
|
if not file:
|
|
# Check to see if it's one of our special internal "files"
|
|
# (see __patched_linecache_getlines).
|
|
file = inspect.getfile(obj)
|
|
if not file[0]+file[-2:] == '<]>': file = None
|
|
if file is None:
|
|
source_lines = None
|
|
else:
|
|
if module is not None:
|
|
# Supply the module globals in case the module was
|
|
# originally loaded via a PEP 302 loader and
|
|
# file is not a valid filesystem path
|
|
source_lines = linecache.getlines(file, module.__dict__)
|
|
else:
|
|
# No access to a loader, so assume it's a normal
|
|
# filesystem path
|
|
source_lines = linecache.getlines(file)
|
|
if not source_lines:
|
|
source_lines = None
|
|
|
|
# Initialize globals, and merge in extraglobs.
|
|
if globs is None:
|
|
if module is None:
|
|
globs = {}
|
|
else:
|
|
globs = module.__dict__.copy()
|
|
else:
|
|
globs = globs.copy()
|
|
if extraglobs is not None:
|
|
globs.update(extraglobs)
|
|
if '__name__' not in globs:
|
|
globs['__name__'] = '__main__' # provide a default module name
|
|
|
|
# Recursively expore `obj`, extracting DocTests.
|
|
tests = []
|
|
self._find(tests, obj, name, module, source_lines, globs, {})
|
|
# Sort the tests by alpha order of names, for consistency in
|
|
# verbose-mode output. This was a feature of doctest in Pythons
|
|
# <= 2.3 that got lost by accident in 2.4. It was repaired in
|
|
# 2.4.4 and 2.5.
|
|
tests.sort()
|
|
return tests
|
|
|
|
def _from_module(self, module, object):
|
|
"""
|
|
Return true if the given object is defined in the given
|
|
module.
|
|
"""
|
|
if module is None:
|
|
return True
|
|
elif inspect.getmodule(object) is not None:
|
|
return module is inspect.getmodule(object)
|
|
elif inspect.isfunction(object):
|
|
return module.__dict__ is object.__globals__
|
|
elif inspect.isclass(object):
|
|
return module.__name__ == object.__module__
|
|
elif hasattr(object, '__module__'):
|
|
return module.__name__ == object.__module__
|
|
elif isinstance(object, property):
|
|
return True # [XX] no way not be sure.
|
|
else:
|
|
raise ValueError("object must be a class or function")
|
|
|
|
def _find(self, tests, obj, name, module, source_lines, globs, seen):
|
|
"""
|
|
Find tests for the given object and any contained objects, and
|
|
add them to `tests`.
|
|
"""
|
|
if self._verbose:
|
|
print('Finding tests in %s' % name)
|
|
|
|
# If we've already processed this object, then ignore it.
|
|
if id(obj) in seen:
|
|
return
|
|
seen[id(obj)] = 1
|
|
|
|
# Find a test for this object, and add it to the list of tests.
|
|
test = self._get_test(obj, name, module, globs, source_lines)
|
|
if test is not None:
|
|
tests.append(test)
|
|
|
|
# Look for tests in a module's contained objects.
|
|
if inspect.ismodule(obj) and self._recurse:
|
|
for valname, val in obj.__dict__.items():
|
|
valname = '%s.%s' % (name, valname)
|
|
# Recurse to functions & classes.
|
|
if ((inspect.isfunction(val) or inspect.isclass(val)) and
|
|
self._from_module(module, val)):
|
|
self._find(tests, val, valname, module, source_lines,
|
|
globs, seen)
|
|
|
|
# Look for tests in a module's __test__ dictionary.
|
|
if inspect.ismodule(obj) and self._recurse:
|
|
for valname, val in getattr(obj, '__test__', {}).items():
|
|
if not isinstance(valname, str):
|
|
raise ValueError("DocTestFinder.find: __test__ keys "
|
|
"must be strings: %r" %
|
|
(type(valname),))
|
|
if not (inspect.isfunction(val) or inspect.isclass(val) or
|
|
inspect.ismethod(val) or inspect.ismodule(val) or
|
|
isinstance(val, str)):
|
|
raise ValueError("DocTestFinder.find: __test__ values "
|
|
"must be strings, functions, methods, "
|
|
"classes, or modules: %r" %
|
|
(type(val),))
|
|
valname = '%s.__test__.%s' % (name, valname)
|
|
self._find(tests, val, valname, module, source_lines,
|
|
globs, seen)
|
|
|
|
# Look for tests in a class's contained objects.
|
|
if inspect.isclass(obj) and self._recurse:
|
|
for valname, val in obj.__dict__.items():
|
|
# Special handling for staticmethod/classmethod.
|
|
if isinstance(val, staticmethod):
|
|
val = getattr(obj, valname)
|
|
if isinstance(val, classmethod):
|
|
val = getattr(obj, valname).__func__
|
|
|
|
# Recurse to methods, properties, and nested classes.
|
|
if ((inspect.isfunction(val) or inspect.isclass(val) or
|
|
isinstance(val, property)) and
|
|
self._from_module(module, val)):
|
|
valname = '%s.%s' % (name, valname)
|
|
self._find(tests, val, valname, module, source_lines,
|
|
globs, seen)
|
|
|
|
def _get_test(self, obj, name, module, globs, source_lines):
|
|
"""
|
|
Return a DocTest for the given object, if it defines a docstring;
|
|
otherwise, return None.
|
|
"""
|
|
# Extract the object's docstring. If it doesn't have one,
|
|
# then return None (no test for this object).
|
|
if isinstance(obj, str):
|
|
docstring = obj
|
|
else:
|
|
try:
|
|
if obj.__doc__ is None:
|
|
docstring = ''
|
|
else:
|
|
docstring = obj.__doc__
|
|
if not isinstance(docstring, str):
|
|
docstring = str(docstring)
|
|
except (TypeError, AttributeError):
|
|
docstring = ''
|
|
|
|
# Find the docstring's location in the file.
|
|
lineno = self._find_lineno(obj, source_lines)
|
|
|
|
# Don't bother if the docstring is empty.
|
|
if self._exclude_empty and not docstring:
|
|
return None
|
|
|
|
# Return a DocTest for this object.
|
|
if module is None:
|
|
filename = None
|
|
else:
|
|
filename = getattr(module, '__file__', module.__name__)
|
|
if filename[-4:] in (".pyc", ".pyo"):
|
|
filename = filename[:-1]
|
|
return self._parser.get_doctest(docstring, globs, name,
|
|
filename, lineno)
|
|
|
|
def _find_lineno(self, obj, source_lines):
|
|
"""
|
|
Return a line number of the given object's docstring. Note:
|
|
this method assumes that the object has a docstring.
|
|
"""
|
|
lineno = None
|
|
|
|
# Find the line number for modules.
|
|
if inspect.ismodule(obj):
|
|
lineno = 0
|
|
|
|
# Find the line number for classes.
|
|
# Note: this could be fooled if a class is defined multiple
|
|
# times in a single file.
|
|
if inspect.isclass(obj):
|
|
if source_lines is None:
|
|
return None
|
|
pat = re.compile(r'^\s*class\s*%s\b' %
|
|
getattr(obj, '__name__', '-'))
|
|
for i, line in enumerate(source_lines):
|
|
if pat.match(line):
|
|
lineno = i
|
|
break
|
|
|
|
# Find the line number for functions & methods.
|
|
if inspect.ismethod(obj): obj = obj.__func__
|
|
if inspect.isfunction(obj): obj = obj.__code__
|
|
if inspect.istraceback(obj): obj = obj.tb_frame
|
|
if inspect.isframe(obj): obj = obj.f_code
|
|
if inspect.iscode(obj):
|
|
lineno = getattr(obj, 'co_firstlineno', None)-1
|
|
|
|
# Find the line number where the docstring starts. Assume
|
|
# that it's the first line that begins with a quote mark.
|
|
# Note: this could be fooled by a multiline function
|
|
# signature, where a continuation line begins with a quote
|
|
# mark.
|
|
if lineno is not None:
|
|
if source_lines is None:
|
|
return lineno+1
|
|
pat = re.compile('(^|.*:)\s*\w*("|\')')
|
|
for lineno in range(lineno, len(source_lines)):
|
|
if pat.match(source_lines[lineno]):
|
|
return lineno
|
|
|
|
# We couldn't find the line number.
|
|
return None
|
|
|
|
######################################################################
|
|
## 5. DocTest Runner
|
|
######################################################################
|
|
|
|
class DocTestRunner:
|
|
"""
|
|
A class used to run DocTest test cases, and accumulate statistics.
|
|
The `run` method is used to process a single DocTest case. It
|
|
returns a tuple `(f, t)`, where `t` is the number of test cases
|
|
tried, and `f` is the number of test cases that failed.
|
|
|
|
>>> tests = DocTestFinder().find(_TestClass)
|
|
>>> runner = DocTestRunner(verbose=False)
|
|
>>> tests.sort(key = lambda test: test.name)
|
|
>>> for test in tests:
|
|
... print(test.name, '->', runner.run(test))
|
|
_TestClass -> TestResults(failed=0, attempted=2)
|
|
_TestClass.__init__ -> TestResults(failed=0, attempted=2)
|
|
_TestClass.get -> TestResults(failed=0, attempted=2)
|
|
_TestClass.square -> TestResults(failed=0, attempted=1)
|
|
|
|
The `summarize` method prints a summary of all the test cases that
|
|
have been run by the runner, and returns an aggregated `(f, t)`
|
|
tuple:
|
|
|
|
>>> runner.summarize(verbose=1)
|
|
4 items passed all tests:
|
|
2 tests in _TestClass
|
|
2 tests in _TestClass.__init__
|
|
2 tests in _TestClass.get
|
|
1 tests in _TestClass.square
|
|
7 tests in 4 items.
|
|
7 passed and 0 failed.
|
|
Test passed.
|
|
TestResults(failed=0, attempted=7)
|
|
|
|
The aggregated number of tried examples and failed examples is
|
|
also available via the `tries` and `failures` attributes:
|
|
|
|
>>> runner.tries
|
|
7
|
|
>>> runner.failures
|
|
0
|
|
|
|
The comparison between expected outputs and actual outputs is done
|
|
by an `OutputChecker`. This comparison may be customized with a
|
|
number of option flags; see the documentation for `testmod` for
|
|
more information. If the option flags are insufficient, then the
|
|
comparison may also be customized by passing a subclass of
|
|
`OutputChecker` to the constructor.
|
|
|
|
The test runner's display output can be controlled in two ways.
|
|
First, an output function (`out) can be passed to
|
|
`TestRunner.run`; this function will be called with strings that
|
|
should be displayed. It defaults to `sys.stdout.write`. If
|
|
capturing the output is not sufficient, then the display output
|
|
can be also customized by subclassing DocTestRunner, and
|
|
overriding the methods `report_start`, `report_success`,
|
|
`report_unexpected_exception`, and `report_failure`.
|
|
"""
|
|
# This divider string is used to separate failure messages, and to
|
|
# separate sections of the summary.
|
|
DIVIDER = "*" * 70
|
|
|
|
def __init__(self, checker=None, verbose=None, optionflags=0):
|
|
"""
|
|
Create a new test runner.
|
|
|
|
Optional keyword arg `checker` is the `OutputChecker` that
|
|
should be used to compare the expected outputs and actual
|
|
outputs of doctest examples.
|
|
|
|
Optional keyword arg 'verbose' prints lots of stuff if true,
|
|
only failures if false; by default, it's true iff '-v' is in
|
|
sys.argv.
|
|
|
|
Optional argument `optionflags` can be used to control how the
|
|
test runner compares expected output to actual output, and how
|
|
it displays failures. See the documentation for `testmod` for
|
|
more information.
|
|
"""
|
|
self._checker = checker or OutputChecker()
|
|
if verbose is None:
|
|
verbose = '-v' in sys.argv
|
|
self._verbose = verbose
|
|
self.optionflags = optionflags
|
|
self.original_optionflags = optionflags
|
|
|
|
# Keep track of the examples we've run.
|
|
self.tries = 0
|
|
self.failures = 0
|
|
self._name2ft = {}
|
|
|
|
# Create a fake output target for capturing doctest output.
|
|
self._fakeout = _SpoofOut()
|
|
|
|
#/////////////////////////////////////////////////////////////////
|
|
# Reporting methods
|
|
#/////////////////////////////////////////////////////////////////
|
|
|
|
def report_start(self, out, test, example):
|
|
"""
|
|
Report that the test runner is about to process the given
|
|
example. (Only displays a message if verbose=True)
|
|
"""
|
|
if self._verbose:
|
|
if example.want:
|
|
out('Trying:\n' + _indent(example.source) +
|
|
'Expecting:\n' + _indent(example.want))
|
|
else:
|
|
out('Trying:\n' + _indent(example.source) +
|
|
'Expecting nothing\n')
|
|
|
|
def report_success(self, out, test, example, got):
|
|
"""
|
|
Report that the given example ran successfully. (Only
|
|
displays a message if verbose=True)
|
|
"""
|
|
if self._verbose:
|
|
out("ok\n")
|
|
|
|
def report_failure(self, out, test, example, got):
|
|
"""
|
|
Report that the given example failed.
|
|
"""
|
|
out(self._failure_header(test, example) +
|
|
self._checker.output_difference(example, got, self.optionflags))
|
|
|
|
def report_unexpected_exception(self, out, test, example, exc_info):
|
|
"""
|
|
Report that the given example raised an unexpected exception.
|
|
"""
|
|
out(self._failure_header(test, example) +
|
|
'Exception raised:\n' + _indent(_exception_traceback(exc_info)))
|
|
|
|
def _failure_header(self, test, example):
|
|
out = [self.DIVIDER]
|
|
if test.filename:
|
|
if test.lineno is not None and example.lineno is not None:
|
|
lineno = test.lineno + example.lineno + 1
|
|
else:
|
|
lineno = '?'
|
|
out.append('File "%s", line %s, in %s' %
|
|
(test.filename, lineno, test.name))
|
|
else:
|
|
out.append('Line %s, in %s' % (example.lineno+1, test.name))
|
|
out.append('Failed example:')
|
|
source = example.source
|
|
out.append(_indent(source))
|
|
return '\n'.join(out)
|
|
|
|
#/////////////////////////////////////////////////////////////////
|
|
# DocTest Running
|
|
#/////////////////////////////////////////////////////////////////
|
|
|
|
def __run(self, test, compileflags, out):
|
|
"""
|
|
Run the examples in `test`. Write the outcome of each example
|
|
with one of the `DocTestRunner.report_*` methods, using the
|
|
writer function `out`. `compileflags` is the set of compiler
|
|
flags that should be used to execute examples. Return a tuple
|
|
`(f, t)`, where `t` is the number of examples tried, and `f`
|
|
is the number of examples that failed. The examples are run
|
|
in the namespace `test.globs`.
|
|
"""
|
|
# Keep track of the number of failures and tries.
|
|
failures = tries = 0
|
|
|
|
# Save the option flags (since option directives can be used
|
|
# to modify them).
|
|
original_optionflags = self.optionflags
|
|
|
|
SUCCESS, FAILURE, BOOM = range(3) # `outcome` state
|
|
|
|
check = self._checker.check_output
|
|
|
|
# Process each example.
|
|
for examplenum, example in enumerate(test.examples):
|
|
|
|
# If REPORT_ONLY_FIRST_FAILURE is set, then suppress
|
|
# reporting after the first failure.
|
|
quiet = (self.optionflags & REPORT_ONLY_FIRST_FAILURE and
|
|
failures > 0)
|
|
|
|
# Merge in the example's options.
|
|
self.optionflags = original_optionflags
|
|
if example.options:
|
|
for (optionflag, val) in example.options.items():
|
|
if val:
|
|
self.optionflags |= optionflag
|
|
else:
|
|
self.optionflags &= ~optionflag
|
|
|
|
# If 'SKIP' is set, then skip this example.
|
|
if self.optionflags & SKIP:
|
|
continue
|
|
|
|
# Record that we started this example.
|
|
tries += 1
|
|
if not quiet:
|
|
self.report_start(out, test, example)
|
|
|
|
# Use a special filename for compile(), so we can retrieve
|
|
# the source code during interactive debugging (see
|
|
# __patched_linecache_getlines).
|
|
filename = '<doctest %s[%d]>' % (test.name, examplenum)
|
|
|
|
# Run the example in the given context (globs), and record
|
|
# any exception that gets raised. (But don't intercept
|
|
# keyboard interrupts.)
|
|
try:
|
|
# Don't blink! This is where the user's code gets run.
|
|
exec(compile(example.source, filename, "single",
|
|
compileflags, 1), test.globs)
|
|
self.debugger.set_continue() # ==== Example Finished ====
|
|
exception = None
|
|
except KeyboardInterrupt:
|
|
raise
|
|
except:
|
|
exception = sys.exc_info()
|
|
self.debugger.set_continue() # ==== Example Finished ====
|
|
|
|
got = self._fakeout.getvalue() # the actual output
|
|
self._fakeout.truncate(0)
|
|
outcome = FAILURE # guilty until proved innocent or insane
|
|
|
|
# If the example executed without raising any exceptions,
|
|
# verify its output.
|
|
if exception is None:
|
|
if check(example.want, got, self.optionflags):
|
|
outcome = SUCCESS
|
|
|
|
# The example raised an exception: check if it was expected.
|
|
else:
|
|
exc_msg = traceback.format_exception_only(*exception[:2])[-1]
|
|
if not quiet:
|
|
got += _exception_traceback(exception)
|
|
|
|
# If `example.exc_msg` is None, then we weren't expecting
|
|
# an exception.
|
|
if example.exc_msg is None:
|
|
outcome = BOOM
|
|
|
|
# We expected an exception: see whether it matches.
|
|
elif check(example.exc_msg, exc_msg, self.optionflags):
|
|
outcome = SUCCESS
|
|
|
|
# Another chance if they didn't care about the detail.
|
|
elif self.optionflags & IGNORE_EXCEPTION_DETAIL:
|
|
m1 = re.match(r'(?:[^:]*\.)?([^:]*:)', example.exc_msg)
|
|
m2 = re.match(r'(?:[^:]*\.)?([^:]*:)', exc_msg)
|
|
if m1 and m2 and check(m1.group(1), m2.group(1),
|
|
self.optionflags):
|
|
outcome = SUCCESS
|
|
|
|
# Report the outcome.
|
|
if outcome is SUCCESS:
|
|
if not quiet:
|
|
self.report_success(out, test, example, got)
|
|
elif outcome is FAILURE:
|
|
if not quiet:
|
|
self.report_failure(out, test, example, got)
|
|
failures += 1
|
|
elif outcome is BOOM:
|
|
if not quiet:
|
|
self.report_unexpected_exception(out, test, example,
|
|
exception)
|
|
failures += 1
|
|
else:
|
|
assert False, ("unknown outcome", outcome)
|
|
|
|
# Restore the option flags (in case they were modified)
|
|
self.optionflags = original_optionflags
|
|
|
|
# Record and return the number of failures and tries.
|
|
self.__record_outcome(test, failures, tries)
|
|
return TestResults(failures, tries)
|
|
|
|
def __record_outcome(self, test, f, t):
|
|
"""
|
|
Record the fact that the given DocTest (`test`) generated `f`
|
|
failures out of `t` tried examples.
|
|
"""
|
|
f2, t2 = self._name2ft.get(test.name, (0,0))
|
|
self._name2ft[test.name] = (f+f2, t+t2)
|
|
self.failures += f
|
|
self.tries += t
|
|
|
|
__LINECACHE_FILENAME_RE = re.compile(r'<doctest '
|
|
r'(?P<name>.+)'
|
|
r'\[(?P<examplenum>\d+)\]>$')
|
|
def __patched_linecache_getlines(self, filename, module_globals=None):
|
|
m = self.__LINECACHE_FILENAME_RE.match(filename)
|
|
if m and m.group('name') == self.test.name:
|
|
example = self.test.examples[int(m.group('examplenum'))]
|
|
return example.source.splitlines(True)
|
|
else:
|
|
return self.save_linecache_getlines(filename, module_globals)
|
|
|
|
def run(self, test, compileflags=None, out=None, clear_globs=True):
|
|
"""
|
|
Run the examples in `test`, and display the results using the
|
|
writer function `out`.
|
|
|
|
The examples are run in the namespace `test.globs`. If
|
|
`clear_globs` is true (the default), then this namespace will
|
|
be cleared after the test runs, to help with garbage
|
|
collection. If you would like to examine the namespace after
|
|
the test completes, then use `clear_globs=False`.
|
|
|
|
`compileflags` gives the set of flags that should be used by
|
|
the Python compiler when running the examples. If not
|
|
specified, then it will default to the set of future-import
|
|
flags that apply to `globs`.
|
|
|
|
The output of each example is checked using
|
|
`DocTestRunner.check_output`, and the results are formatted by
|
|
the `DocTestRunner.report_*` methods.
|
|
"""
|
|
self.test = test
|
|
|
|
if compileflags is None:
|
|
compileflags = _extract_future_flags(test.globs)
|
|
|
|
save_stdout = sys.stdout
|
|
if out is None:
|
|
encoding = save_stdout.encoding
|
|
if encoding is None or encoding.lower() == 'utf-8':
|
|
out = save_stdout.write
|
|
else:
|
|
# Use backslashreplace error handling on write
|
|
def out(s):
|
|
s = str(s.encode(encoding, 'backslashreplace'), encoding)
|
|
save_stdout.write(s)
|
|
sys.stdout = self._fakeout
|
|
|
|
# Patch pdb.set_trace to restore sys.stdout during interactive
|
|
# debugging (so it's not still redirected to self._fakeout).
|
|
# Note that the interactive output will go to *our*
|
|
# save_stdout, even if that's not the real sys.stdout; this
|
|
# allows us to write test cases for the set_trace behavior.
|
|
save_trace = sys.gettrace()
|
|
save_set_trace = pdb.set_trace
|
|
self.debugger = _OutputRedirectingPdb(save_stdout)
|
|
self.debugger.reset()
|
|
pdb.set_trace = self.debugger.set_trace
|
|
|
|
# Patch linecache.getlines, so we can see the example's source
|
|
# when we're inside the debugger.
|
|
self.save_linecache_getlines = linecache.getlines
|
|
linecache.getlines = self.__patched_linecache_getlines
|
|
|
|
# Make sure sys.displayhook just prints the value to stdout
|
|
save_displayhook = sys.displayhook
|
|
sys.displayhook = sys.__displayhook__
|
|
|
|
try:
|
|
return self.__run(test, compileflags, out)
|
|
finally:
|
|
sys.stdout = save_stdout
|
|
pdb.set_trace = save_set_trace
|
|
sys.settrace(save_trace)
|
|
linecache.getlines = self.save_linecache_getlines
|
|
sys.displayhook = save_displayhook
|
|
if clear_globs:
|
|
test.globs.clear()
|
|
import builtins
|
|
builtins._ = None
|
|
|
|
#/////////////////////////////////////////////////////////////////
|
|
# Summarization
|
|
#/////////////////////////////////////////////////////////////////
|
|
def summarize(self, verbose=None):
|
|
"""
|
|
Print a summary of all the test cases that have been run by
|
|
this DocTestRunner, and return a tuple `(f, t)`, where `f` is
|
|
the total number of failed examples, and `t` is the total
|
|
number of tried examples.
|
|
|
|
The optional `verbose` argument controls how detailed the
|
|
summary is. If the verbosity is not specified, then the
|
|
DocTestRunner's verbosity is used.
|
|
"""
|
|
if verbose is None:
|
|
verbose = self._verbose
|
|
notests = []
|
|
passed = []
|
|
failed = []
|
|
totalt = totalf = 0
|
|
for x in self._name2ft.items():
|
|
name, (f, t) = x
|
|
assert f <= t
|
|
totalt += t
|
|
totalf += f
|
|
if t == 0:
|
|
notests.append(name)
|
|
elif f == 0:
|
|
passed.append( (name, t) )
|
|
else:
|
|
failed.append(x)
|
|
if verbose:
|
|
if notests:
|
|
print(len(notests), "items had no tests:")
|
|
notests.sort()
|
|
for thing in notests:
|
|
print(" ", thing)
|
|
if passed:
|
|
print(len(passed), "items passed all tests:")
|
|
passed.sort()
|
|
for thing, count in passed:
|
|
print(" %3d tests in %s" % (count, thing))
|
|
if failed:
|
|
print(self.DIVIDER)
|
|
print(len(failed), "items had failures:")
|
|
failed.sort()
|
|
for thing, (f, t) in failed:
|
|
print(" %3d of %3d in %s" % (f, t, thing))
|
|
if verbose:
|
|
print(totalt, "tests in", len(self._name2ft), "items.")
|
|
print(totalt - totalf, "passed and", totalf, "failed.")
|
|
if totalf:
|
|
print("***Test Failed***", totalf, "failures.")
|
|
elif verbose:
|
|
print("Test passed.")
|
|
return TestResults(totalf, totalt)
|
|
|
|
#/////////////////////////////////////////////////////////////////
|
|
# Backward compatibility cruft to maintain doctest.master.
|
|
#/////////////////////////////////////////////////////////////////
|
|
def merge(self, other):
|
|
d = self._name2ft
|
|
for name, (f, t) in other._name2ft.items():
|
|
if name in d:
|
|
# Don't print here by default, since doing
|
|
# so breaks some of the buildbots
|
|
#print("*** DocTestRunner.merge: '" + name + "' in both" \
|
|
# " testers; summing outcomes.")
|
|
f2, t2 = d[name]
|
|
f = f + f2
|
|
t = t + t2
|
|
d[name] = f, t
|
|
|
|
class OutputChecker:
|
|
"""
|
|
A class used to check the whether the actual output from a doctest
|
|
example matches the expected output. `OutputChecker` defines two
|
|
methods: `check_output`, which compares a given pair of outputs,
|
|
and returns true if they match; and `output_difference`, which
|
|
returns a string describing the differences between two outputs.
|
|
"""
|
|
def _toAscii(self, s):
|
|
"""
|
|
Convert string to hex-escaped ASCII string.
|
|
"""
|
|
return str(s.encode('ASCII', 'backslashreplace'), "ASCII")
|
|
|
|
def check_output(self, want, got, optionflags):
|
|
"""
|
|
Return True iff the actual output from an example (`got`)
|
|
matches the expected output (`want`). These strings are
|
|
always considered to match if they are identical; but
|
|
depending on what option flags the test runner is using,
|
|
several non-exact match types are also possible. See the
|
|
documentation for `TestRunner` for more information about
|
|
option flags.
|
|
"""
|
|
|
|
# If `want` contains hex-escaped character such as "\u1234",
|
|
# then `want` is a string of six characters(e.g. [\,u,1,2,3,4]).
|
|
# On the other hand, `got` could be an another sequence of
|
|
# characters such as [\u1234], so `want` and `got` should
|
|
# be folded to hex-escaped ASCII string to compare.
|
|
got = self._toAscii(got)
|
|
want = self._toAscii(want)
|
|
|
|
# Handle the common case first, for efficiency:
|
|
# if they're string-identical, always return true.
|
|
if got == want:
|
|
return True
|
|
|
|
# The values True and False replaced 1 and 0 as the return
|
|
# value for boolean comparisons in Python 2.3.
|
|
if not (optionflags & DONT_ACCEPT_TRUE_FOR_1):
|
|
if (got,want) == ("True\n", "1\n"):
|
|
return True
|
|
if (got,want) == ("False\n", "0\n"):
|
|
return True
|
|
|
|
# <BLANKLINE> can be used as a special sequence to signify a
|
|
# blank line, unless the DONT_ACCEPT_BLANKLINE flag is used.
|
|
if not (optionflags & DONT_ACCEPT_BLANKLINE):
|
|
# Replace <BLANKLINE> in want with a blank line.
|
|
want = re.sub('(?m)^%s\s*?$' % re.escape(BLANKLINE_MARKER),
|
|
'', want)
|
|
# If a line in got contains only spaces, then remove the
|
|
# spaces.
|
|
got = re.sub('(?m)^\s*?$', '', got)
|
|
if got == want:
|
|
return True
|
|
|
|
# This flag causes doctest to ignore any differences in the
|
|
# contents of whitespace strings. Note that this can be used
|
|
# in conjunction with the ELLIPSIS flag.
|
|
if optionflags & NORMALIZE_WHITESPACE:
|
|
got = ' '.join(got.split())
|
|
want = ' '.join(want.split())
|
|
if got == want:
|
|
return True
|
|
|
|
# The ELLIPSIS flag says to let the sequence "..." in `want`
|
|
# match any substring in `got`.
|
|
if optionflags & ELLIPSIS:
|
|
if _ellipsis_match(want, got):
|
|
return True
|
|
|
|
# We didn't find any match; return false.
|
|
return False
|
|
|
|
# Should we do a fancy diff?
|
|
def _do_a_fancy_diff(self, want, got, optionflags):
|
|
# Not unless they asked for a fancy diff.
|
|
if not optionflags & (REPORT_UDIFF |
|
|
REPORT_CDIFF |
|
|
REPORT_NDIFF):
|
|
return False
|
|
|
|
# If expected output uses ellipsis, a meaningful fancy diff is
|
|
# too hard ... or maybe not. In two real-life failures Tim saw,
|
|
# a diff was a major help anyway, so this is commented out.
|
|
# [todo] _ellipsis_match() knows which pieces do and don't match,
|
|
# and could be the basis for a kick-ass diff in this case.
|
|
##if optionflags & ELLIPSIS and ELLIPSIS_MARKER in want:
|
|
## return False
|
|
|
|
# ndiff does intraline difference marking, so can be useful even
|
|
# for 1-line differences.
|
|
if optionflags & REPORT_NDIFF:
|
|
return True
|
|
|
|
# The other diff types need at least a few lines to be helpful.
|
|
return want.count('\n') > 2 and got.count('\n') > 2
|
|
|
|
def output_difference(self, example, got, optionflags):
|
|
"""
|
|
Return a string describing the differences between the
|
|
expected output for a given example (`example`) and the actual
|
|
output (`got`). `optionflags` is the set of option flags used
|
|
to compare `want` and `got`.
|
|
"""
|
|
want = example.want
|
|
# If <BLANKLINE>s are being used, then replace blank lines
|
|
# with <BLANKLINE> in the actual output string.
|
|
if not (optionflags & DONT_ACCEPT_BLANKLINE):
|
|
got = re.sub('(?m)^[ ]*(?=\n)', BLANKLINE_MARKER, got)
|
|
|
|
# Check if we should use diff.
|
|
if self._do_a_fancy_diff(want, got, optionflags):
|
|
# Split want & got into lines.
|
|
want_lines = want.splitlines(True) # True == keep line ends
|
|
got_lines = got.splitlines(True)
|
|
# Use difflib to find their differences.
|
|
if optionflags & REPORT_UDIFF:
|
|
diff = difflib.unified_diff(want_lines, got_lines, n=2)
|
|
diff = list(diff)[2:] # strip the diff header
|
|
kind = 'unified diff with -expected +actual'
|
|
elif optionflags & REPORT_CDIFF:
|
|
diff = difflib.context_diff(want_lines, got_lines, n=2)
|
|
diff = list(diff)[2:] # strip the diff header
|
|
kind = 'context diff with expected followed by actual'
|
|
elif optionflags & REPORT_NDIFF:
|
|
engine = difflib.Differ(charjunk=difflib.IS_CHARACTER_JUNK)
|
|
diff = list(engine.compare(want_lines, got_lines))
|
|
kind = 'ndiff with -expected +actual'
|
|
else:
|
|
assert 0, 'Bad diff option'
|
|
# Remove trailing whitespace on diff output.
|
|
diff = [line.rstrip() + '\n' for line in diff]
|
|
return 'Differences (%s):\n' % kind + _indent(''.join(diff))
|
|
|
|
# If we're not using diff, then simply list the expected
|
|
# output followed by the actual output.
|
|
if want and got:
|
|
return 'Expected:\n%sGot:\n%s' % (_indent(want), _indent(got))
|
|
elif want:
|
|
return 'Expected:\n%sGot nothing\n' % _indent(want)
|
|
elif got:
|
|
return 'Expected nothing\nGot:\n%s' % _indent(got)
|
|
else:
|
|
return 'Expected nothing\nGot nothing\n'
|
|
|
|
class DocTestFailure(Exception):
|
|
"""A DocTest example has failed in debugging mode.
|
|
|
|
The exception instance has variables:
|
|
|
|
- test: the DocTest object being run
|
|
|
|
- example: the Example object that failed
|
|
|
|
- got: the actual output
|
|
"""
|
|
def __init__(self, test, example, got):
|
|
self.test = test
|
|
self.example = example
|
|
self.got = got
|
|
|
|
def __str__(self):
|
|
return str(self.test)
|
|
|
|
class UnexpectedException(Exception):
|
|
"""A DocTest example has encountered an unexpected exception
|
|
|
|
The exception instance has variables:
|
|
|
|
- test: the DocTest object being run
|
|
|
|
- example: the Example object that failed
|
|
|
|
- exc_info: the exception info
|
|
"""
|
|
def __init__(self, test, example, exc_info):
|
|
self.test = test
|
|
self.example = example
|
|
self.exc_info = exc_info
|
|
|
|
def __str__(self):
|
|
return str(self.test)
|
|
|
|
class DebugRunner(DocTestRunner):
|
|
r"""Run doc tests but raise an exception as soon as there is a failure.
|
|
|
|
If an unexpected exception occurs, an UnexpectedException is raised.
|
|
It contains the test, the example, and the original exception:
|
|
|
|
>>> runner = DebugRunner(verbose=False)
|
|
>>> test = DocTestParser().get_doctest('>>> raise KeyError\n42',
|
|
... {}, 'foo', 'foo.py', 0)
|
|
>>> try:
|
|
... runner.run(test)
|
|
... except UnexpectedException as f:
|
|
... failure = f
|
|
|
|
>>> failure.test is test
|
|
True
|
|
|
|
>>> failure.example.want
|
|
'42\n'
|
|
|
|
>>> exc_info = failure.exc_info
|
|
>>> raise exc_info[1] # Already has the traceback
|
|
Traceback (most recent call last):
|
|
...
|
|
KeyError
|
|
|
|
We wrap the original exception to give the calling application
|
|
access to the test and example information.
|
|
|
|
If the output doesn't match, then a DocTestFailure is raised:
|
|
|
|
>>> test = DocTestParser().get_doctest('''
|
|
... >>> x = 1
|
|
... >>> x
|
|
... 2
|
|
... ''', {}, 'foo', 'foo.py', 0)
|
|
|
|
>>> try:
|
|
... runner.run(test)
|
|
... except DocTestFailure as f:
|
|
... failure = f
|
|
|
|
DocTestFailure objects provide access to the test:
|
|
|
|
>>> failure.test is test
|
|
True
|
|
|
|
As well as to the example:
|
|
|
|
>>> failure.example.want
|
|
'2\n'
|
|
|
|
and the actual output:
|
|
|
|
>>> failure.got
|
|
'1\n'
|
|
|
|
If a failure or error occurs, the globals are left intact:
|
|
|
|
>>> del test.globs['__builtins__']
|
|
>>> test.globs
|
|
{'x': 1}
|
|
|
|
>>> test = DocTestParser().get_doctest('''
|
|
... >>> x = 2
|
|
... >>> raise KeyError
|
|
... ''', {}, 'foo', 'foo.py', 0)
|
|
|
|
>>> runner.run(test)
|
|
Traceback (most recent call last):
|
|
...
|
|
doctest.UnexpectedException: <DocTest foo from foo.py:0 (2 examples)>
|
|
|
|
>>> del test.globs['__builtins__']
|
|
>>> test.globs
|
|
{'x': 2}
|
|
|
|
But the globals are cleared if there is no error:
|
|
|
|
>>> test = DocTestParser().get_doctest('''
|
|
... >>> x = 2
|
|
... ''', {}, 'foo', 'foo.py', 0)
|
|
|
|
>>> runner.run(test)
|
|
TestResults(failed=0, attempted=1)
|
|
|
|
>>> test.globs
|
|
{}
|
|
|
|
"""
|
|
|
|
def run(self, test, compileflags=None, out=None, clear_globs=True):
|
|
r = DocTestRunner.run(self, test, compileflags, out, False)
|
|
if clear_globs:
|
|
test.globs.clear()
|
|
return r
|
|
|
|
def report_unexpected_exception(self, out, test, example, exc_info):
|
|
raise UnexpectedException(test, example, exc_info)
|
|
|
|
def report_failure(self, out, test, example, got):
|
|
raise DocTestFailure(test, example, got)
|
|
|
|
######################################################################
|
|
## 6. Test Functions
|
|
######################################################################
|
|
# These should be backwards compatible.
|
|
|
|
# For backward compatibility, a global instance of a DocTestRunner
|
|
# class, updated by testmod.
|
|
master = None
|
|
|
|
def testmod(m=None, name=None, globs=None, verbose=None,
|
|
report=True, optionflags=0, extraglobs=None,
|
|
raise_on_error=False, exclude_empty=False):
|
|
"""m=None, name=None, globs=None, verbose=None, report=True,
|
|
optionflags=0, extraglobs=None, raise_on_error=False,
|
|
exclude_empty=False
|
|
|
|
Test examples in docstrings in functions and classes reachable
|
|
from module m (or the current module if m is not supplied), starting
|
|
with m.__doc__.
|
|
|
|
Also test examples reachable from dict m.__test__ if it exists and is
|
|
not None. m.__test__ maps names to functions, classes and strings;
|
|
function and class docstrings are tested even if the name is private;
|
|
strings are tested directly, as if they were docstrings.
|
|
|
|
Return (#failures, #tests).
|
|
|
|
See help(doctest) for an overview.
|
|
|
|
Optional keyword arg "name" gives the name of the module; by default
|
|
use m.__name__.
|
|
|
|
Optional keyword arg "globs" gives a dict to be used as the globals
|
|
when executing examples; by default, use m.__dict__. A copy of this
|
|
dict is actually used for each docstring, so that each docstring's
|
|
examples start with a clean slate.
|
|
|
|
Optional keyword arg "extraglobs" gives a dictionary that should be
|
|
merged into the globals that are used to execute examples. By
|
|
default, no extra globals are used. This is new in 2.4.
|
|
|
|
Optional keyword arg "verbose" prints lots of stuff if true, prints
|
|
only failures if false; by default, it's true iff "-v" is in sys.argv.
|
|
|
|
Optional keyword arg "report" prints a summary at the end when true,
|
|
else prints nothing at the end. In verbose mode, the summary is
|
|
detailed, else very brief (in fact, empty if all tests passed).
|
|
|
|
Optional keyword arg "optionflags" or's together module constants,
|
|
and defaults to 0. This is new in 2.3. Possible values (see the
|
|
docs for details):
|
|
|
|
DONT_ACCEPT_TRUE_FOR_1
|
|
DONT_ACCEPT_BLANKLINE
|
|
NORMALIZE_WHITESPACE
|
|
ELLIPSIS
|
|
SKIP
|
|
IGNORE_EXCEPTION_DETAIL
|
|
REPORT_UDIFF
|
|
REPORT_CDIFF
|
|
REPORT_NDIFF
|
|
REPORT_ONLY_FIRST_FAILURE
|
|
|
|
Optional keyword arg "raise_on_error" raises an exception on the
|
|
first unexpected exception or failure. This allows failures to be
|
|
post-mortem debugged.
|
|
|
|
Advanced tomfoolery: testmod runs methods of a local instance of
|
|
class doctest.Tester, then merges the results into (or creates)
|
|
global Tester instance doctest.master. Methods of doctest.master
|
|
can be called directly too, if you want to do something unusual.
|
|
Passing report=0 to testmod is especially useful then, to delay
|
|
displaying a summary. Invoke doctest.master.summarize(verbose)
|
|
when you're done fiddling.
|
|
"""
|
|
global master
|
|
|
|
# If no module was given, then use __main__.
|
|
if m is None:
|
|
# DWA - m will still be None if this wasn't invoked from the command
|
|
# line, in which case the following TypeError is about as good an error
|
|
# as we should expect
|
|
m = sys.modules.get('__main__')
|
|
|
|
# Check that we were actually given a module.
|
|
if not inspect.ismodule(m):
|
|
raise TypeError("testmod: module required; %r" % (m,))
|
|
|
|
# If no name was given, then use the module's name.
|
|
if name is None:
|
|
name = m.__name__
|
|
|
|
# Find, parse, and run all tests in the given module.
|
|
finder = DocTestFinder(exclude_empty=exclude_empty)
|
|
|
|
if raise_on_error:
|
|
runner = DebugRunner(verbose=verbose, optionflags=optionflags)
|
|
else:
|
|
runner = DocTestRunner(verbose=verbose, optionflags=optionflags)
|
|
|
|
for test in finder.find(m, name, globs=globs, extraglobs=extraglobs):
|
|
runner.run(test)
|
|
|
|
if report:
|
|
runner.summarize()
|
|
|
|
if master is None:
|
|
master = runner
|
|
else:
|
|
master.merge(runner)
|
|
|
|
return TestResults(runner.failures, runner.tries)
|
|
|
|
def testfile(filename, module_relative=True, name=None, package=None,
|
|
globs=None, verbose=None, report=True, optionflags=0,
|
|
extraglobs=None, raise_on_error=False, parser=DocTestParser(),
|
|
encoding=None):
|
|
"""
|
|
Test examples in the given file. Return (#failures, #tests).
|
|
|
|
Optional keyword arg "module_relative" specifies how filenames
|
|
should be interpreted:
|
|
|
|
- If "module_relative" is True (the default), then "filename"
|
|
specifies a module-relative path. By default, this path is
|
|
relative to the calling module's directory; but if the
|
|
"package" argument is specified, then it is relative to that
|
|
package. To ensure os-independence, "filename" should use
|
|
"/" characters to separate path segments, and should not
|
|
be an absolute path (i.e., it may not begin with "/").
|
|
|
|
- If "module_relative" is False, then "filename" specifies an
|
|
os-specific path. The path may be absolute or relative (to
|
|
the current working directory).
|
|
|
|
Optional keyword arg "name" gives the name of the test; by default
|
|
use the file's basename.
|
|
|
|
Optional keyword argument "package" is a Python package or the
|
|
name of a Python package whose directory should be used as the
|
|
base directory for a module relative filename. If no package is
|
|
specified, then the calling module's directory is used as the base
|
|
directory for module relative filenames. It is an error to
|
|
specify "package" if "module_relative" is False.
|
|
|
|
Optional keyword arg "globs" gives a dict to be used as the globals
|
|
when executing examples; by default, use {}. A copy of this dict
|
|
is actually used for each docstring, so that each docstring's
|
|
examples start with a clean slate.
|
|
|
|
Optional keyword arg "extraglobs" gives a dictionary that should be
|
|
merged into the globals that are used to execute examples. By
|
|
default, no extra globals are used.
|
|
|
|
Optional keyword arg "verbose" prints lots of stuff if true, prints
|
|
only failures if false; by default, it's true iff "-v" is in sys.argv.
|
|
|
|
Optional keyword arg "report" prints a summary at the end when true,
|
|
else prints nothing at the end. In verbose mode, the summary is
|
|
detailed, else very brief (in fact, empty if all tests passed).
|
|
|
|
Optional keyword arg "optionflags" or's together module constants,
|
|
and defaults to 0. Possible values (see the docs for details):
|
|
|
|
DONT_ACCEPT_TRUE_FOR_1
|
|
DONT_ACCEPT_BLANKLINE
|
|
NORMALIZE_WHITESPACE
|
|
ELLIPSIS
|
|
SKIP
|
|
IGNORE_EXCEPTION_DETAIL
|
|
REPORT_UDIFF
|
|
REPORT_CDIFF
|
|
REPORT_NDIFF
|
|
REPORT_ONLY_FIRST_FAILURE
|
|
|
|
Optional keyword arg "raise_on_error" raises an exception on the
|
|
first unexpected exception or failure. This allows failures to be
|
|
post-mortem debugged.
|
|
|
|
Optional keyword arg "parser" specifies a DocTestParser (or
|
|
subclass) that should be used to extract tests from the files.
|
|
|
|
Optional keyword arg "encoding" specifies an encoding that should
|
|
be used to convert the file to unicode.
|
|
|
|
Advanced tomfoolery: testmod runs methods of a local instance of
|
|
class doctest.Tester, then merges the results into (or creates)
|
|
global Tester instance doctest.master. Methods of doctest.master
|
|
can be called directly too, if you want to do something unusual.
|
|
Passing report=0 to testmod is especially useful then, to delay
|
|
displaying a summary. Invoke doctest.master.summarize(verbose)
|
|
when you're done fiddling.
|
|
"""
|
|
global master
|
|
|
|
if package and not module_relative:
|
|
raise ValueError("Package may only be specified for module-"
|
|
"relative paths.")
|
|
|
|
# Relativize the path
|
|
text, filename = _load_testfile(filename, package, module_relative,
|
|
encoding or "utf-8")
|
|
|
|
# If no name was given, then use the file's name.
|
|
if name is None:
|
|
name = os.path.basename(filename)
|
|
|
|
# Assemble the globals.
|
|
if globs is None:
|
|
globs = {}
|
|
else:
|
|
globs = globs.copy()
|
|
if extraglobs is not None:
|
|
globs.update(extraglobs)
|
|
if '__name__' not in globs:
|
|
globs['__name__'] = '__main__'
|
|
|
|
if raise_on_error:
|
|
runner = DebugRunner(verbose=verbose, optionflags=optionflags)
|
|
else:
|
|
runner = DocTestRunner(verbose=verbose, optionflags=optionflags)
|
|
|
|
# Read the file, convert it to a test, and run it.
|
|
test = parser.get_doctest(text, globs, name, filename, 0)
|
|
runner.run(test)
|
|
|
|
if report:
|
|
runner.summarize()
|
|
|
|
if master is None:
|
|
master = runner
|
|
else:
|
|
master.merge(runner)
|
|
|
|
return TestResults(runner.failures, runner.tries)
|
|
|
|
def run_docstring_examples(f, globs, verbose=False, name="NoName",
|
|
compileflags=None, optionflags=0):
|
|
"""
|
|
Test examples in the given object's docstring (`f`), using `globs`
|
|
as globals. Optional argument `name` is used in failure messages.
|
|
If the optional argument `verbose` is true, then generate output
|
|
even if there are no failures.
|
|
|
|
`compileflags` gives the set of flags that should be used by the
|
|
Python compiler when running the examples. If not specified, then
|
|
it will default to the set of future-import flags that apply to
|
|
`globs`.
|
|
|
|
Optional keyword arg `optionflags` specifies options for the
|
|
testing and output. See the documentation for `testmod` for more
|
|
information.
|
|
"""
|
|
# Find, parse, and run all tests in the given module.
|
|
finder = DocTestFinder(verbose=verbose, recurse=False)
|
|
runner = DocTestRunner(verbose=verbose, optionflags=optionflags)
|
|
for test in finder.find(f, name, globs=globs):
|
|
runner.run(test, compileflags=compileflags)
|
|
|
|
######################################################################
|
|
## 7. Unittest Support
|
|
######################################################################
|
|
|
|
_unittest_reportflags = 0
|
|
|
|
def set_unittest_reportflags(flags):
|
|
"""Sets the unittest option flags.
|
|
|
|
The old flag is returned so that a runner could restore the old
|
|
value if it wished to:
|
|
|
|
>>> import doctest
|
|
>>> old = doctest._unittest_reportflags
|
|
>>> doctest.set_unittest_reportflags(REPORT_NDIFF |
|
|
... REPORT_ONLY_FIRST_FAILURE) == old
|
|
True
|
|
|
|
>>> doctest._unittest_reportflags == (REPORT_NDIFF |
|
|
... REPORT_ONLY_FIRST_FAILURE)
|
|
True
|
|
|
|
Only reporting flags can be set:
|
|
|
|
>>> doctest.set_unittest_reportflags(ELLIPSIS)
|
|
Traceback (most recent call last):
|
|
...
|
|
ValueError: ('Only reporting flags allowed', 8)
|
|
|
|
>>> doctest.set_unittest_reportflags(old) == (REPORT_NDIFF |
|
|
... REPORT_ONLY_FIRST_FAILURE)
|
|
True
|
|
"""
|
|
global _unittest_reportflags
|
|
|
|
if (flags & REPORTING_FLAGS) != flags:
|
|
raise ValueError("Only reporting flags allowed", flags)
|
|
old = _unittest_reportflags
|
|
_unittest_reportflags = flags
|
|
return old
|
|
|
|
|
|
class DocTestCase(unittest.TestCase):
|
|
|
|
def __init__(self, test, optionflags=0, setUp=None, tearDown=None,
|
|
checker=None):
|
|
|
|
unittest.TestCase.__init__(self)
|
|
self._dt_optionflags = optionflags
|
|
self._dt_checker = checker
|
|
self._dt_test = test
|
|
self._dt_setUp = setUp
|
|
self._dt_tearDown = tearDown
|
|
|
|
def setUp(self):
|
|
test = self._dt_test
|
|
|
|
if self._dt_setUp is not None:
|
|
self._dt_setUp(test)
|
|
|
|
def tearDown(self):
|
|
test = self._dt_test
|
|
|
|
if self._dt_tearDown is not None:
|
|
self._dt_tearDown(test)
|
|
|
|
test.globs.clear()
|
|
|
|
def runTest(self):
|
|
test = self._dt_test
|
|
old = sys.stdout
|
|
new = StringIO()
|
|
optionflags = self._dt_optionflags
|
|
|
|
if not (optionflags & REPORTING_FLAGS):
|
|
# The option flags don't include any reporting flags,
|
|
# so add the default reporting flags
|
|
optionflags |= _unittest_reportflags
|
|
|
|
runner = DocTestRunner(optionflags=optionflags,
|
|
checker=self._dt_checker, verbose=False)
|
|
|
|
try:
|
|
runner.DIVIDER = "-"*70
|
|
failures, tries = runner.run(
|
|
test, out=new.write, clear_globs=False)
|
|
finally:
|
|
sys.stdout = old
|
|
|
|
if failures:
|
|
raise self.failureException(self.format_failure(new.getvalue()))
|
|
|
|
def format_failure(self, err):
|
|
test = self._dt_test
|
|
if test.lineno is None:
|
|
lineno = 'unknown line number'
|
|
else:
|
|
lineno = '%s' % test.lineno
|
|
lname = '.'.join(test.name.split('.')[-1:])
|
|
return ('Failed doctest test for %s\n'
|
|
' File "%s", line %s, in %s\n\n%s'
|
|
% (test.name, test.filename, lineno, lname, err)
|
|
)
|
|
|
|
def debug(self):
|
|
r"""Run the test case without results and without catching exceptions
|
|
|
|
The unit test framework includes a debug method on test cases
|
|
and test suites to support post-mortem debugging. The test code
|
|
is run in such a way that errors are not caught. This way a
|
|
caller can catch the errors and initiate post-mortem debugging.
|
|
|
|
The DocTestCase provides a debug method that raises
|
|
UnexpectedException errors if there is an unexpected
|
|
exception:
|
|
|
|
>>> test = DocTestParser().get_doctest('>>> raise KeyError\n42',
|
|
... {}, 'foo', 'foo.py', 0)
|
|
>>> case = DocTestCase(test)
|
|
>>> try:
|
|
... case.debug()
|
|
... except UnexpectedException as f:
|
|
... failure = f
|
|
|
|
The UnexpectedException contains the test, the example, and
|
|
the original exception:
|
|
|
|
>>> failure.test is test
|
|
True
|
|
|
|
>>> failure.example.want
|
|
'42\n'
|
|
|
|
>>> exc_info = failure.exc_info
|
|
>>> raise exc_info[1] # Already has the traceback
|
|
Traceback (most recent call last):
|
|
...
|
|
KeyError
|
|
|
|
If the output doesn't match, then a DocTestFailure is raised:
|
|
|
|
>>> test = DocTestParser().get_doctest('''
|
|
... >>> x = 1
|
|
... >>> x
|
|
... 2
|
|
... ''', {}, 'foo', 'foo.py', 0)
|
|
>>> case = DocTestCase(test)
|
|
|
|
>>> try:
|
|
... case.debug()
|
|
... except DocTestFailure as f:
|
|
... failure = f
|
|
|
|
DocTestFailure objects provide access to the test:
|
|
|
|
>>> failure.test is test
|
|
True
|
|
|
|
As well as to the example:
|
|
|
|
>>> failure.example.want
|
|
'2\n'
|
|
|
|
and the actual output:
|
|
|
|
>>> failure.got
|
|
'1\n'
|
|
|
|
"""
|
|
|
|
self.setUp()
|
|
runner = DebugRunner(optionflags=self._dt_optionflags,
|
|
checker=self._dt_checker, verbose=False)
|
|
runner.run(self._dt_test, clear_globs=False)
|
|
self.tearDown()
|
|
|
|
def id(self):
|
|
return self._dt_test.name
|
|
|
|
def __repr__(self):
|
|
name = self._dt_test.name.split('.')
|
|
return "%s (%s)" % (name[-1], '.'.join(name[:-1]))
|
|
|
|
__str__ = __repr__
|
|
|
|
def shortDescription(self):
|
|
return "Doctest: " + self._dt_test.name
|
|
|
|
class SkipDocTestCase(DocTestCase):
|
|
def __init__(self):
|
|
DocTestCase.__init__(self, None)
|
|
|
|
def setUp(self):
|
|
self.skipTest("DocTestSuite will not work with -O2 and above")
|
|
|
|
def test_skip(self):
|
|
pass
|
|
|
|
def shortDescription(self):
|
|
return "Skipping tests from %s" % module.__name__
|
|
|
|
def DocTestSuite(module=None, globs=None, extraglobs=None, test_finder=None,
|
|
**options):
|
|
"""
|
|
Convert doctest tests for a module to a unittest test suite.
|
|
|
|
This converts each documentation string in a module that
|
|
contains doctest tests to a unittest test case. If any of the
|
|
tests in a doc string fail, then the test case fails. An exception
|
|
is raised showing the name of the file containing the test and a
|
|
(sometimes approximate) line number.
|
|
|
|
The `module` argument provides the module to be tested. The argument
|
|
can be either a module or a module name.
|
|
|
|
If no argument is given, the calling module is used.
|
|
|
|
A number of options may be provided as keyword arguments:
|
|
|
|
setUp
|
|
A set-up function. This is called before running the
|
|
tests in each file. The setUp function will be passed a DocTest
|
|
object. The setUp function can access the test globals as the
|
|
globs attribute of the test passed.
|
|
|
|
tearDown
|
|
A tear-down function. This is called after running the
|
|
tests in each file. The tearDown function will be passed a DocTest
|
|
object. The tearDown function can access the test globals as the
|
|
globs attribute of the test passed.
|
|
|
|
globs
|
|
A dictionary containing initial global variables for the tests.
|
|
|
|
optionflags
|
|
A set of doctest option flags expressed as an integer.
|
|
"""
|
|
|
|
if test_finder is None:
|
|
test_finder = DocTestFinder()
|
|
|
|
module = _normalize_module(module)
|
|
tests = test_finder.find(module, globs=globs, extraglobs=extraglobs)
|
|
|
|
if not tests and sys.flags.optimize >=2:
|
|
# Skip doctests when running with -O2
|
|
suite = unittest.TestSuite()
|
|
suite.addTest(SkipDocTestCase())
|
|
return suite
|
|
elif not tests:
|
|
# Why do we want to do this? Because it reveals a bug that might
|
|
# otherwise be hidden.
|
|
raise ValueError(module, "has no tests")
|
|
|
|
tests.sort()
|
|
suite = unittest.TestSuite()
|
|
|
|
for test in tests:
|
|
if len(test.examples) == 0:
|
|
continue
|
|
if not test.filename:
|
|
filename = module.__file__
|
|
if filename[-4:] in (".pyc", ".pyo"):
|
|
filename = filename[:-1]
|
|
test.filename = filename
|
|
suite.addTest(DocTestCase(test, **options))
|
|
|
|
return suite
|
|
|
|
class DocFileCase(DocTestCase):
|
|
|
|
def id(self):
|
|
return '_'.join(self._dt_test.name.split('.'))
|
|
|
|
def __repr__(self):
|
|
return self._dt_test.filename
|
|
__str__ = __repr__
|
|
|
|
def format_failure(self, err):
|
|
return ('Failed doctest test for %s\n File "%s", line 0\n\n%s'
|
|
% (self._dt_test.name, self._dt_test.filename, err)
|
|
)
|
|
|
|
def DocFileTest(path, module_relative=True, package=None,
|
|
globs=None, parser=DocTestParser(),
|
|
encoding=None, **options):
|
|
if globs is None:
|
|
globs = {}
|
|
else:
|
|
globs = globs.copy()
|
|
|
|
if package and not module_relative:
|
|
raise ValueError("Package may only be specified for module-"
|
|
"relative paths.")
|
|
|
|
# Relativize the path.
|
|
doc, path = _load_testfile(path, package, module_relative,
|
|
encoding or "utf-8")
|
|
|
|
if "__file__" not in globs:
|
|
globs["__file__"] = path
|
|
|
|
# Find the file and read it.
|
|
name = os.path.basename(path)
|
|
|
|
# Convert it to a test, and wrap it in a DocFileCase.
|
|
test = parser.get_doctest(doc, globs, name, path, 0)
|
|
return DocFileCase(test, **options)
|
|
|
|
def DocFileSuite(*paths, **kw):
|
|
"""A unittest suite for one or more doctest files.
|
|
|
|
The path to each doctest file is given as a string; the
|
|
interpretation of that string depends on the keyword argument
|
|
"module_relative".
|
|
|
|
A number of options may be provided as keyword arguments:
|
|
|
|
module_relative
|
|
If "module_relative" is True, then the given file paths are
|
|
interpreted as os-independent module-relative paths. By
|
|
default, these paths are relative to the calling module's
|
|
directory; but if the "package" argument is specified, then
|
|
they are relative to that package. To ensure os-independence,
|
|
"filename" should use "/" characters to separate path
|
|
segments, and may not be an absolute path (i.e., it may not
|
|
begin with "/").
|
|
|
|
If "module_relative" is False, then the given file paths are
|
|
interpreted as os-specific paths. These paths may be absolute
|
|
or relative (to the current working directory).
|
|
|
|
package
|
|
A Python package or the name of a Python package whose directory
|
|
should be used as the base directory for module relative paths.
|
|
If "package" is not specified, then the calling module's
|
|
directory is used as the base directory for module relative
|
|
filenames. It is an error to specify "package" if
|
|
"module_relative" is False.
|
|
|
|
setUp
|
|
A set-up function. This is called before running the
|
|
tests in each file. The setUp function will be passed a DocTest
|
|
object. The setUp function can access the test globals as the
|
|
globs attribute of the test passed.
|
|
|
|
tearDown
|
|
A tear-down function. This is called after running the
|
|
tests in each file. The tearDown function will be passed a DocTest
|
|
object. The tearDown function can access the test globals as the
|
|
globs attribute of the test passed.
|
|
|
|
globs
|
|
A dictionary containing initial global variables for the tests.
|
|
|
|
optionflags
|
|
A set of doctest option flags expressed as an integer.
|
|
|
|
parser
|
|
A DocTestParser (or subclass) that should be used to extract
|
|
tests from the files.
|
|
|
|
encoding
|
|
An encoding that will be used to convert the files to unicode.
|
|
"""
|
|
suite = unittest.TestSuite()
|
|
|
|
# We do this here so that _normalize_module is called at the right
|
|
# level. If it were called in DocFileTest, then this function
|
|
# would be the caller and we might guess the package incorrectly.
|
|
if kw.get('module_relative', True):
|
|
kw['package'] = _normalize_module(kw.get('package'))
|
|
|
|
for path in paths:
|
|
suite.addTest(DocFileTest(path, **kw))
|
|
|
|
return suite
|
|
|
|
######################################################################
|
|
## 8. Debugging Support
|
|
######################################################################
|
|
|
|
def script_from_examples(s):
|
|
r"""Extract script from text with examples.
|
|
|
|
Converts text with examples to a Python script. Example input is
|
|
converted to regular code. Example output and all other words
|
|
are converted to comments:
|
|
|
|
>>> text = '''
|
|
... Here are examples of simple math.
|
|
...
|
|
... Python has super accurate integer addition
|
|
...
|
|
... >>> 2 + 2
|
|
... 5
|
|
...
|
|
... And very friendly error messages:
|
|
...
|
|
... >>> 1/0
|
|
... To Infinity
|
|
... And
|
|
... Beyond
|
|
...
|
|
... You can use logic if you want:
|
|
...
|
|
... >>> if 0:
|
|
... ... blah
|
|
... ... blah
|
|
... ...
|
|
...
|
|
... Ho hum
|
|
... '''
|
|
|
|
>>> print(script_from_examples(text))
|
|
# Here are examples of simple math.
|
|
#
|
|
# Python has super accurate integer addition
|
|
#
|
|
2 + 2
|
|
# Expected:
|
|
## 5
|
|
#
|
|
# And very friendly error messages:
|
|
#
|
|
1/0
|
|
# Expected:
|
|
## To Infinity
|
|
## And
|
|
## Beyond
|
|
#
|
|
# You can use logic if you want:
|
|
#
|
|
if 0:
|
|
blah
|
|
blah
|
|
#
|
|
# Ho hum
|
|
<BLANKLINE>
|
|
"""
|
|
output = []
|
|
for piece in DocTestParser().parse(s):
|
|
if isinstance(piece, Example):
|
|
# Add the example's source code (strip trailing NL)
|
|
output.append(piece.source[:-1])
|
|
# Add the expected output:
|
|
want = piece.want
|
|
if want:
|
|
output.append('# Expected:')
|
|
output += ['## '+l for l in want.split('\n')[:-1]]
|
|
else:
|
|
# Add non-example text.
|
|
output += [_comment_line(l)
|
|
for l in piece.split('\n')[:-1]]
|
|
|
|
# Trim junk on both ends.
|
|
while output and output[-1] == '#':
|
|
output.pop()
|
|
while output and output[0] == '#':
|
|
output.pop(0)
|
|
# Combine the output, and return it.
|
|
# Add a courtesy newline to prevent exec from choking (see bug #1172785)
|
|
return '\n'.join(output) + '\n'
|
|
|
|
def testsource(module, name):
|
|
"""Extract the test sources from a doctest docstring as a script.
|
|
|
|
Provide the module (or dotted name of the module) containing the
|
|
test to be debugged and the name (within the module) of the object
|
|
with the doc string with tests to be debugged.
|
|
"""
|
|
module = _normalize_module(module)
|
|
tests = DocTestFinder().find(module)
|
|
test = [t for t in tests if t.name == name]
|
|
if not test:
|
|
raise ValueError(name, "not found in tests")
|
|
test = test[0]
|
|
testsrc = script_from_examples(test.docstring)
|
|
return testsrc
|
|
|
|
def debug_src(src, pm=False, globs=None):
|
|
"""Debug a single doctest docstring, in argument `src`'"""
|
|
testsrc = script_from_examples(src)
|
|
debug_script(testsrc, pm, globs)
|
|
|
|
def debug_script(src, pm=False, globs=None):
|
|
"Debug a test script. `src` is the script, as a string."
|
|
import pdb
|
|
|
|
# Note that tempfile.NameTemporaryFile() cannot be used. As the
|
|
# docs say, a file so created cannot be opened by name a second time
|
|
# on modern Windows boxes, and exec() needs to open and read it.
|
|
srcfilename = tempfile.mktemp(".py", "doctestdebug")
|
|
f = open(srcfilename, 'w')
|
|
f.write(src)
|
|
f.close()
|
|
|
|
try:
|
|
if globs:
|
|
globs = globs.copy()
|
|
else:
|
|
globs = {}
|
|
|
|
if pm:
|
|
try:
|
|
with open(srcfilename) as f:
|
|
exec(f.read(), globs, globs)
|
|
except:
|
|
print(sys.exc_info()[1])
|
|
p = pdb.Pdb(nosigint=True)
|
|
p.reset()
|
|
p.interaction(None, sys.exc_info()[2])
|
|
else:
|
|
fp = open(srcfilename)
|
|
try:
|
|
script = fp.read()
|
|
finally:
|
|
fp.close()
|
|
pdb.Pdb(nosigint=True).run("exec(%r)" % script, globs, globs)
|
|
|
|
finally:
|
|
os.remove(srcfilename)
|
|
|
|
def debug(module, name, pm=False):
|
|
"""Debug a single doctest docstring.
|
|
|
|
Provide the module (or dotted name of the module) containing the
|
|
test to be debugged and the name (within the module) of the object
|
|
with the docstring with tests to be debugged.
|
|
"""
|
|
module = _normalize_module(module)
|
|
testsrc = testsource(module, name)
|
|
debug_script(testsrc, pm, module.__dict__)
|
|
|
|
######################################################################
|
|
## 9. Example Usage
|
|
######################################################################
|
|
class _TestClass:
|
|
"""
|
|
A pointless class, for sanity-checking of docstring testing.
|
|
|
|
Methods:
|
|
square()
|
|
get()
|
|
|
|
>>> _TestClass(13).get() + _TestClass(-12).get()
|
|
1
|
|
>>> hex(_TestClass(13).square().get())
|
|
'0xa9'
|
|
"""
|
|
|
|
def __init__(self, val):
|
|
"""val -> _TestClass object with associated value val.
|
|
|
|
>>> t = _TestClass(123)
|
|
>>> print(t.get())
|
|
123
|
|
"""
|
|
|
|
self.val = val
|
|
|
|
def square(self):
|
|
"""square() -> square TestClass's associated value
|
|
|
|
>>> _TestClass(13).square().get()
|
|
169
|
|
"""
|
|
|
|
self.val = self.val ** 2
|
|
return self
|
|
|
|
def get(self):
|
|
"""get() -> return TestClass's associated value.
|
|
|
|
>>> x = _TestClass(-42)
|
|
>>> print(x.get())
|
|
-42
|
|
"""
|
|
|
|
return self.val
|
|
|
|
__test__ = {"_TestClass": _TestClass,
|
|
"string": r"""
|
|
Example of a string object, searched as-is.
|
|
>>> x = 1; y = 2
|
|
>>> x + y, x * y
|
|
(3, 2)
|
|
""",
|
|
|
|
"bool-int equivalence": r"""
|
|
In 2.2, boolean expressions displayed
|
|
0 or 1. By default, we still accept
|
|
them. This can be disabled by passing
|
|
DONT_ACCEPT_TRUE_FOR_1 to the new
|
|
optionflags argument.
|
|
>>> 4 == 4
|
|
1
|
|
>>> 4 == 4
|
|
True
|
|
>>> 4 > 4
|
|
0
|
|
>>> 4 > 4
|
|
False
|
|
""",
|
|
|
|
"blank lines": r"""
|
|
Blank lines can be marked with <BLANKLINE>:
|
|
>>> print('foo\n\nbar\n')
|
|
foo
|
|
<BLANKLINE>
|
|
bar
|
|
<BLANKLINE>
|
|
""",
|
|
|
|
"ellipsis": r"""
|
|
If the ellipsis flag is used, then '...' can be used to
|
|
elide substrings in the desired output:
|
|
>>> print(list(range(1000))) #doctest: +ELLIPSIS
|
|
[0, 1, 2, ..., 999]
|
|
""",
|
|
|
|
"whitespace normalization": r"""
|
|
If the whitespace normalization flag is used, then
|
|
differences in whitespace are ignored.
|
|
>>> print(list(range(30))) #doctest: +NORMALIZE_WHITESPACE
|
|
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
|
|
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26,
|
|
27, 28, 29]
|
|
""",
|
|
}
|
|
|
|
|
|
def _test():
|
|
testfiles = [arg for arg in sys.argv[1:] if arg and arg[0] != '-']
|
|
if not testfiles:
|
|
name = os.path.basename(sys.argv[0])
|
|
if '__loader__' in globals(): # python -m
|
|
name, _ = os.path.splitext(name)
|
|
print("usage: {0} [-v] file ...".format(name))
|
|
return 2
|
|
for filename in testfiles:
|
|
if filename.endswith(".py"):
|
|
# It is a module -- insert its dir into sys.path and try to
|
|
# import it. If it is part of a package, that possibly
|
|
# won't work because of package imports.
|
|
dirname, filename = os.path.split(filename)
|
|
sys.path.insert(0, dirname)
|
|
m = __import__(filename[:-3])
|
|
del sys.path[0]
|
|
failures, _ = testmod(m)
|
|
else:
|
|
failures, _ = testfile(filename, module_relative=False)
|
|
if failures:
|
|
return 1
|
|
return 0
|
|
|
|
|
|
if __name__ == "__main__":
|
|
sys.exit(_test())
|