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https://github.com/python/cpython.git
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2c318a1390
and relies much more on meta path finders to abstract out various parts of import. As part of this the semantics for import_module tightened up and now follow __import__ much more closely (biggest thing is that the 'package' argument must now already be imported, else a SystemError is raised).
106 lines
4.2 KiB
Python
106 lines
4.2 KiB
Python
from importlib import machinery
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from .. import util
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from . import util as import_util
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from contextlib import nested
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import imp
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import os
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import sys
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from test import support
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from types import MethodType
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import unittest
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class FinderTests(unittest.TestCase):
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"""Tests for SysPathImporter."""
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def test_failure(self):
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# Test None returned upon not finding a suitable finder.
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def mock_implicit_hooks():
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return []
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# XXX Not blackbox.
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original_hooks = machinery.PathFinder._implicit_hooks
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machinery.PathFinder._implicit_hooks = staticmethod(mock_implicit_hooks)
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try:
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with util.import_state():
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self.assert_(machinery.PathFinder.find_module('XXX') is None)
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finally:
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machinery.PathFinder._implicit_hooks = original_hooks
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def test_sys_path(self):
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# Test that sys.path is used when 'path' is None.
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# Implicitly tests that sys.path_importer_cache is used.
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module = '<test module>'
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path = '<test path>'
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importer = util.mock_modules(module)
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with util.import_state(path_importer_cache={path: importer},
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path=[path]):
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loader = machinery.PathFinder.find_module(module)
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self.assert_(loader is importer)
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def test_path(self):
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# Test that 'path' is used when set.
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# Implicitly tests that sys.path_importer_cache is used.
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module = '<test module>'
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path = '<test path>'
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importer = util.mock_modules(module)
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with util.import_state(path_importer_cache={path: importer}):
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loader = machinery.PathFinder.find_module(module, [path])
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self.assert_(loader is importer)
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def test_path_importer_cache_has_None(self):
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# Test that the default hook is used when sys.path_importer_cache
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# contains None for a path.
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module = '<test module>'
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importer = util.mock_modules(module)
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path = '<test path>'
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# XXX Not blackbox.
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original_hook = machinery.PathFinder._default_hook
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mock_hook = import_util.mock_path_hook(path, importer=importer)
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machinery.PathFinder._default_hook = staticmethod(mock_hook)
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try:
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with util.import_state(path_importer_cache={path: None}):
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loader = machinery.PathFinder.find_module(module, path=[path])
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self.assert_(loader is importer)
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finally:
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machinery.PathFinder._default_hook = original_hook
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def test_path_hooks(self):
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# Test that sys.path_hooks is used.
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# Test that sys.path_importer_cache is set.
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module = '<test module>'
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path = '<test path>'
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importer = util.mock_modules(module)
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hook = import_util.mock_path_hook(path, importer=importer)
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with util.import_state(path_hooks=[hook]):
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loader = machinery.PathFinder.find_module(module, [path])
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self.assert_(loader is importer)
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self.assert_(path in sys.path_importer_cache)
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self.assert_(sys.path_importer_cache[path] is importer)
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def test_implicit_hooks(self):
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# Test that the implicit path hooks are used.
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existing_path = os.path.dirname(support.TESTFN)
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bad_path = '<path>'
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module = '<module>'
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assert not os.path.exists(bad_path)
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with util.import_state():
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nothing = machinery.PathFinder.find_module(module,
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path=[existing_path])
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self.assert_(nothing is None)
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self.assert_(existing_path in sys.path_importer_cache)
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self.assert_(not isinstance(sys.path_importer_cache[existing_path],
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imp.NullImporter))
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nothing = machinery.PathFinder.find_module(module, path=[bad_path])
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self.assert_(nothing is None)
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self.assert_(bad_path in sys.path_importer_cache)
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self.assert_(isinstance(sys.path_importer_cache[bad_path],
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imp.NullImporter))
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def test_main():
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from test.support import run_unittest
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run_unittest(PathTests, __path__Tests, FinderTests)
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if __name__ == '__main__':
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test_main()
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