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292 lines
8.6 KiB
Python
292 lines
8.6 KiB
Python
"""Supporting definitions for the Python regression tests."""
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if __name__ != 'test.test_support':
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raise ImportError, 'test_support must be imported from the test package'
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import sys
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class Error(Exception):
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"""Base class for regression test exceptions."""
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class TestFailed(Error):
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"""Test failed."""
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class TestSkipped(Error):
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"""Test skipped.
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This can be raised to indicate that a test was deliberatly
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skipped, but not because a feature wasn't available. For
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example, if some resource can't be used, such as the network
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appears to be unavailable, this should be raised instead of
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TestFailed.
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"""
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class ResourceDenied(TestSkipped):
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"""Test skipped because it requested a disallowed resource.
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This is raised when a test calls requires() for a resource that
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has not be enabled. It is used to distinguish between expected
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and unexpected skips.
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"""
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verbose = 1 # Flag set to 0 by regrtest.py
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use_resources = None # Flag set to [] by regrtest.py
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# _original_stdout is meant to hold stdout at the time regrtest began.
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# This may be "the real" stdout, or IDLE's emulation of stdout, or whatever.
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# The point is to have some flavor of stdout the user can actually see.
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_original_stdout = None
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def record_original_stdout(stdout):
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global _original_stdout
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_original_stdout = stdout
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def get_original_stdout():
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return _original_stdout or sys.stdout
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def unload(name):
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try:
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del sys.modules[name]
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except KeyError:
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pass
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def forget(modname):
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'''"Forget" a module was ever imported by removing it from sys.modules and
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deleting any .pyc and .pyo files.'''
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unload(modname)
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import os
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for dirname in sys.path:
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try:
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os.unlink(os.path.join(dirname, modname + os.extsep + 'pyc'))
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except os.error:
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pass
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# Deleting the .pyo file cannot be within the 'try' for the .pyc since
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# the chance exists that there is no .pyc (and thus the 'try' statement
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# is exited) but there is a .pyo file.
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try:
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os.unlink(os.path.join(dirname, modname + os.extsep + 'pyo'))
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except os.error:
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pass
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def is_resource_enabled(resource):
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"""Test whether a resource is enabled. Known resources are set by
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regrtest.py."""
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return use_resources is not None and resource in use_resources
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def requires(resource, msg=None):
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"""Raise ResourceDenied if the specified resource is not available.
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If the caller's module is __main__ then automatically return True. The
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possibility of False being returned occurs when regrtest.py is executing."""
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# see if the caller's module is __main__ - if so, treat as if
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# the resource was set
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if sys._getframe().f_back.f_globals.get("__name__") == "__main__":
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return
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if not is_resource_enabled(resource):
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if msg is None:
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msg = "Use of the `%s' resource not enabled" % resource
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raise ResourceDenied(msg)
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FUZZ = 1e-6
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def fcmp(x, y): # fuzzy comparison function
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if type(x) == type(0.0) or type(y) == type(0.0):
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try:
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x, y = coerce(x, y)
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fuzz = (abs(x) + abs(y)) * FUZZ
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if abs(x-y) <= fuzz:
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return 0
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except:
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pass
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elif type(x) == type(y) and type(x) in (type(()), type([])):
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for i in range(min(len(x), len(y))):
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outcome = fcmp(x[i], y[i])
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if outcome != 0:
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return outcome
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return cmp(len(x), len(y))
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return cmp(x, y)
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try:
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unicode
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have_unicode = 1
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except NameError:
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have_unicode = 0
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is_jython = sys.platform.startswith('java')
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import os
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# Filename used for testing
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if os.name == 'java':
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# Jython disallows @ in module names
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TESTFN = '$test'
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elif os.name == 'riscos':
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TESTFN = 'testfile'
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else:
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TESTFN = '@test'
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# Unicode name only used if TEST_FN_ENCODING exists for the platform.
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if have_unicode:
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if isinstance('', unicode):
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# python -U
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# XXX perhaps unicode() should accept Unicode strings?
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TESTFN_UNICODE="@test-\xe0\xf2"
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else:
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TESTFN_UNICODE=unicode("@test-\xe0\xf2", "latin-1") # 2 latin characters.
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TESTFN_ENCODING=sys.getfilesystemencoding()
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# Make sure we can write to TESTFN, try in /tmp if we can't
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fp = None
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try:
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fp = open(TESTFN, 'w+')
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except IOError:
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TMP_TESTFN = os.path.join('/tmp', TESTFN)
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try:
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fp = open(TMP_TESTFN, 'w+')
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TESTFN = TMP_TESTFN
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del TMP_TESTFN
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except IOError:
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print ('WARNING: tests will fail, unable to write to: %s or %s' %
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(TESTFN, TMP_TESTFN))
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if fp is not None:
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fp.close()
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try:
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os.unlink(TESTFN)
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except:
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pass
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del os, fp
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from os import unlink
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def findfile(file, here=__file__):
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"""Try to find a file on sys.path and the working directory. If it is not
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found the argument passed to the function is returned (this does not
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necessarily signal failure; could still be the legitimate path)."""
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import os
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if os.path.isabs(file):
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return file
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path = sys.path
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path = [os.path.dirname(here)] + path
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for dn in path:
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fn = os.path.join(dn, file)
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if os.path.exists(fn): return fn
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return file
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def verify(condition, reason='test failed'):
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"""Verify that condition is true. If not, raise TestFailed.
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The optional argument reason can be given to provide
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a better error text.
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"""
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if not condition:
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raise TestFailed(reason)
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def vereq(a, b):
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"""Raise TestFailed if a == b is false.
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This is better than verify(a == b) because, in case of failure, the
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error message incorporates repr(a) and repr(b) so you can see the
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inputs.
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Note that "not (a == b)" isn't necessarily the same as "a != b"; the
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former is tested.
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"""
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if not (a == b):
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raise TestFailed, "%r == %r" % (a, b)
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def sortdict(dict):
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"Like repr(dict), but in sorted order."
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items = dict.items()
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items.sort()
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reprpairs = ["%r: %r" % pair for pair in items]
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withcommas = ", ".join(reprpairs)
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return "{%s}" % withcommas
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def check_syntax(statement):
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try:
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compile(statement, '<string>', 'exec')
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except SyntaxError:
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pass
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else:
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print 'Missing SyntaxError: "%s"' % statement
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#=======================================================================
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# Preliminary PyUNIT integration.
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import unittest
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class BasicTestRunner:
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def run(self, test):
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result = unittest.TestResult()
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test(result)
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return result
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def run_suite(suite, testclass=None):
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"""Run tests from a unittest.TestSuite-derived class."""
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if verbose:
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runner = unittest.TextTestRunner(sys.stdout, verbosity=2)
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else:
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runner = BasicTestRunner()
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result = runner.run(suite)
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if not result.wasSuccessful():
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if len(result.errors) == 1 and not result.failures:
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err = result.errors[0][1]
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elif len(result.failures) == 1 and not result.errors:
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err = result.failures[0][1]
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else:
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if testclass is None:
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msg = "errors occurred; run in verbose mode for details"
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else:
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msg = "errors occurred in %s.%s" \
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% (testclass.__module__, testclass.__name__)
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raise TestFailed(msg)
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raise TestFailed(err)
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def run_unittest(*classes):
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"""Run tests from unittest.TestCase-derived classes."""
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suite = unittest.TestSuite()
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for cls in classes:
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suite.addTest(unittest.makeSuite(cls))
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if len(classes)==1:
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testclass = classes[0]
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else:
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testclass = None
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run_suite(suite, testclass)
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#=======================================================================
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# doctest driver.
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def run_doctest(module, verbosity=None):
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"""Run doctest on the given module. Return (#failures, #tests).
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If optional argument verbosity is not specified (or is None), pass
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test_support's belief about verbosity on to doctest. Else doctest's
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usual behavior is used (it searches sys.argv for -v).
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"""
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import doctest
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if verbosity is None:
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verbosity = verbose
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else:
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verbosity = None
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# Direct doctest output (normally just errors) to real stdout; doctest
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# output shouldn't be compared by regrtest.
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save_stdout = sys.stdout
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sys.stdout = get_original_stdout()
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try:
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f, t = doctest.testmod(module, verbose=verbosity)
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if f:
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raise TestFailed("%d of %d doctests failed" % (f, t))
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finally:
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sys.stdout = save_stdout
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if verbose:
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print 'doctest (%s) ... %d tests with zero failures' % (module.__name__, t)
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return f, t
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