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svn+ssh://pythondev@svn.python.org/python/trunk ........ r67688 | amaury.forgeotdarc | 2008-12-11 00:22:49 +0100 (jeu., 11 déc. 2008) | 6 lines #4559: When a context manager's __exit__() method returns an object whose conversion to bool raises an exception, 'with' loses that exception. Reviewed by Jeffrey Yasskin. Already ported to 2.5, will port to 2.6 and 3.0 ........
669 lines
23 KiB
Python
669 lines
23 KiB
Python
#!/usr/bin/env python
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"""Unit tests for the with statement specified in PEP 343."""
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__author__ = "Mike Bland"
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__email__ = "mbland at acm dot org"
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import sys
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import unittest
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from collections import deque
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from contextlib import GeneratorContextManager, contextmanager
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from test.support import run_unittest
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class MockContextManager(GeneratorContextManager):
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def __init__(self, gen):
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GeneratorContextManager.__init__(self, gen)
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self.enter_called = False
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self.exit_called = False
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self.exit_args = None
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def __enter__(self):
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self.enter_called = True
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return GeneratorContextManager.__enter__(self)
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def __exit__(self, type, value, traceback):
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self.exit_called = True
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self.exit_args = (type, value, traceback)
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return GeneratorContextManager.__exit__(self, type,
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value, traceback)
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def mock_contextmanager(func):
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def helper(*args, **kwds):
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return MockContextManager(func(*args, **kwds))
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return helper
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class MockResource(object):
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def __init__(self):
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self.yielded = False
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self.stopped = False
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@mock_contextmanager
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def mock_contextmanager_generator():
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mock = MockResource()
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try:
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mock.yielded = True
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yield mock
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finally:
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mock.stopped = True
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class Nested(object):
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def __init__(self, *managers):
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self.managers = managers
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self.entered = None
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def __enter__(self):
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if self.entered is not None:
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raise RuntimeError("Context is not reentrant")
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self.entered = deque()
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vars = []
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try:
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for mgr in self.managers:
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vars.append(mgr.__enter__())
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self.entered.appendleft(mgr)
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except:
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if not self.__exit__(*sys.exc_info()):
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raise
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return vars
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def __exit__(self, *exc_info):
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# Behave like nested with statements
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# first in, last out
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# New exceptions override old ones
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ex = exc_info
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for mgr in self.entered:
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try:
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if mgr.__exit__(*ex):
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ex = (None, None, None)
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except:
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ex = sys.exc_info()
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self.entered = None
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if ex is not exc_info:
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raise ex[0](ex[1]).with_traceback(ex[2])
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class MockNested(Nested):
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def __init__(self, *managers):
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Nested.__init__(self, *managers)
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self.enter_called = False
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self.exit_called = False
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self.exit_args = None
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def __enter__(self):
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self.enter_called = True
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return Nested.__enter__(self)
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def __exit__(self, *exc_info):
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self.exit_called = True
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self.exit_args = exc_info
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return Nested.__exit__(self, *exc_info)
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class FailureTestCase(unittest.TestCase):
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def testNameError(self):
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def fooNotDeclared():
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with foo: pass
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self.assertRaises(NameError, fooNotDeclared)
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def testEnterAttributeError(self):
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class LacksEnter(object):
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def __exit__(self, type, value, traceback):
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pass
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def fooLacksEnter():
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foo = LacksEnter()
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with foo: pass
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self.assertRaises(AttributeError, fooLacksEnter)
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def testExitAttributeError(self):
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class LacksExit(object):
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def __enter__(self):
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pass
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def fooLacksExit():
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foo = LacksExit()
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with foo: pass
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self.assertRaises(AttributeError, fooLacksExit)
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def assertRaisesSyntaxError(self, codestr):
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def shouldRaiseSyntaxError(s):
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compile(s, '', 'single')
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self.assertRaises(SyntaxError, shouldRaiseSyntaxError, codestr)
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def testAssignmentToNoneError(self):
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self.assertRaisesSyntaxError('with mock as None:\n pass')
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self.assertRaisesSyntaxError(
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'with mock as (None):\n'
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' pass')
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def testAssignmentToEmptyTupleError(self):
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self.assertRaisesSyntaxError(
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'with mock as ():\n'
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' pass')
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def testAssignmentToTupleOnlyContainingNoneError(self):
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self.assertRaisesSyntaxError('with mock as None,:\n pass')
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self.assertRaisesSyntaxError(
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'with mock as (None,):\n'
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' pass')
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def testAssignmentToTupleContainingNoneError(self):
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self.assertRaisesSyntaxError(
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'with mock as (foo, None, bar):\n'
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' pass')
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def testEnterThrows(self):
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class EnterThrows(object):
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def __enter__(self):
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raise RuntimeError("Enter threw")
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def __exit__(self, *args):
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pass
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def shouldThrow():
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ct = EnterThrows()
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self.foo = None
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with ct as self.foo:
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pass
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self.assertRaises(RuntimeError, shouldThrow)
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self.assertEqual(self.foo, None)
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def testExitThrows(self):
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class ExitThrows(object):
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def __enter__(self):
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return
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def __exit__(self, *args):
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raise RuntimeError(42)
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def shouldThrow():
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with ExitThrows():
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pass
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self.assertRaises(RuntimeError, shouldThrow)
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class ContextmanagerAssertionMixin(object):
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def setUp(self):
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self.TEST_EXCEPTION = RuntimeError("test exception")
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def assertInWithManagerInvariants(self, mock_manager):
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self.assertTrue(mock_manager.enter_called)
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self.assertFalse(mock_manager.exit_called)
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self.assertEqual(mock_manager.exit_args, None)
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def assertAfterWithManagerInvariants(self, mock_manager, exit_args):
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self.assertTrue(mock_manager.enter_called)
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self.assertTrue(mock_manager.exit_called)
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self.assertEqual(mock_manager.exit_args, exit_args)
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def assertAfterWithManagerInvariantsNoError(self, mock_manager):
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self.assertAfterWithManagerInvariants(mock_manager,
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(None, None, None))
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def assertInWithGeneratorInvariants(self, mock_generator):
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self.assertTrue(mock_generator.yielded)
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self.assertFalse(mock_generator.stopped)
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def assertAfterWithGeneratorInvariantsNoError(self, mock_generator):
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self.assertTrue(mock_generator.yielded)
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self.assertTrue(mock_generator.stopped)
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def raiseTestException(self):
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raise self.TEST_EXCEPTION
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def assertAfterWithManagerInvariantsWithError(self, mock_manager):
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self.assertTrue(mock_manager.enter_called)
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self.assertTrue(mock_manager.exit_called)
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self.assertEqual(mock_manager.exit_args[0], RuntimeError)
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self.assertEqual(mock_manager.exit_args[1], self.TEST_EXCEPTION)
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def assertAfterWithGeneratorInvariantsWithError(self, mock_generator):
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self.assertTrue(mock_generator.yielded)
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self.assertTrue(mock_generator.stopped)
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class NonexceptionalTestCase(unittest.TestCase, ContextmanagerAssertionMixin):
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def testInlineGeneratorSyntax(self):
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with mock_contextmanager_generator():
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pass
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def testUnboundGenerator(self):
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mock = mock_contextmanager_generator()
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with mock:
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pass
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self.assertAfterWithManagerInvariantsNoError(mock)
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def testInlineGeneratorBoundSyntax(self):
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with mock_contextmanager_generator() as foo:
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self.assertInWithGeneratorInvariants(foo)
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# FIXME: In the future, we'll try to keep the bound names from leaking
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self.assertAfterWithGeneratorInvariantsNoError(foo)
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def testInlineGeneratorBoundToExistingVariable(self):
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foo = None
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with mock_contextmanager_generator() as foo:
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self.assertInWithGeneratorInvariants(foo)
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self.assertAfterWithGeneratorInvariantsNoError(foo)
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def testInlineGeneratorBoundToDottedVariable(self):
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with mock_contextmanager_generator() as self.foo:
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self.assertInWithGeneratorInvariants(self.foo)
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self.assertAfterWithGeneratorInvariantsNoError(self.foo)
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def testBoundGenerator(self):
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mock = mock_contextmanager_generator()
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with mock as foo:
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self.assertInWithGeneratorInvariants(foo)
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self.assertInWithManagerInvariants(mock)
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self.assertAfterWithGeneratorInvariantsNoError(foo)
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self.assertAfterWithManagerInvariantsNoError(mock)
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def testNestedSingleStatements(self):
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mock_a = mock_contextmanager_generator()
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with mock_a as foo:
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mock_b = mock_contextmanager_generator()
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with mock_b as bar:
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self.assertInWithManagerInvariants(mock_a)
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self.assertInWithManagerInvariants(mock_b)
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self.assertInWithGeneratorInvariants(foo)
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self.assertInWithGeneratorInvariants(bar)
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self.assertAfterWithManagerInvariantsNoError(mock_b)
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self.assertAfterWithGeneratorInvariantsNoError(bar)
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self.assertInWithManagerInvariants(mock_a)
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self.assertInWithGeneratorInvariants(foo)
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self.assertAfterWithManagerInvariantsNoError(mock_a)
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self.assertAfterWithGeneratorInvariantsNoError(foo)
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class NestedNonexceptionalTestCase(unittest.TestCase,
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ContextmanagerAssertionMixin):
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def testSingleArgInlineGeneratorSyntax(self):
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with Nested(mock_contextmanager_generator()):
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pass
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def testSingleArgUnbound(self):
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mock_contextmanager = mock_contextmanager_generator()
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mock_nested = MockNested(mock_contextmanager)
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with mock_nested:
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self.assertInWithManagerInvariants(mock_contextmanager)
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self.assertInWithManagerInvariants(mock_nested)
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self.assertAfterWithManagerInvariantsNoError(mock_contextmanager)
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self.assertAfterWithManagerInvariantsNoError(mock_nested)
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def testSingleArgBoundToNonTuple(self):
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m = mock_contextmanager_generator()
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# This will bind all the arguments to nested() into a single list
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# assigned to foo.
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with Nested(m) as foo:
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self.assertInWithManagerInvariants(m)
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self.assertAfterWithManagerInvariantsNoError(m)
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def testSingleArgBoundToSingleElementParenthesizedList(self):
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m = mock_contextmanager_generator()
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# This will bind all the arguments to nested() into a single list
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# assigned to foo.
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with Nested(m) as (foo):
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self.assertInWithManagerInvariants(m)
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self.assertAfterWithManagerInvariantsNoError(m)
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def testSingleArgBoundToMultipleElementTupleError(self):
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def shouldThrowValueError():
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with Nested(mock_contextmanager_generator()) as (foo, bar):
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pass
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self.assertRaises(ValueError, shouldThrowValueError)
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def testSingleArgUnbound(self):
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mock_contextmanager = mock_contextmanager_generator()
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mock_nested = MockNested(mock_contextmanager)
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with mock_nested:
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self.assertInWithManagerInvariants(mock_contextmanager)
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self.assertInWithManagerInvariants(mock_nested)
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self.assertAfterWithManagerInvariantsNoError(mock_contextmanager)
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self.assertAfterWithManagerInvariantsNoError(mock_nested)
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def testMultipleArgUnbound(self):
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m = mock_contextmanager_generator()
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n = mock_contextmanager_generator()
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o = mock_contextmanager_generator()
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mock_nested = MockNested(m, n, o)
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with mock_nested:
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self.assertInWithManagerInvariants(m)
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self.assertInWithManagerInvariants(n)
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self.assertInWithManagerInvariants(o)
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self.assertInWithManagerInvariants(mock_nested)
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self.assertAfterWithManagerInvariantsNoError(m)
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self.assertAfterWithManagerInvariantsNoError(n)
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self.assertAfterWithManagerInvariantsNoError(o)
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self.assertAfterWithManagerInvariantsNoError(mock_nested)
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def testMultipleArgBound(self):
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mock_nested = MockNested(mock_contextmanager_generator(),
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mock_contextmanager_generator(), mock_contextmanager_generator())
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with mock_nested as (m, n, o):
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self.assertInWithGeneratorInvariants(m)
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self.assertInWithGeneratorInvariants(n)
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self.assertInWithGeneratorInvariants(o)
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self.assertInWithManagerInvariants(mock_nested)
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self.assertAfterWithGeneratorInvariantsNoError(m)
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self.assertAfterWithGeneratorInvariantsNoError(n)
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self.assertAfterWithGeneratorInvariantsNoError(o)
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self.assertAfterWithManagerInvariantsNoError(mock_nested)
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class ExceptionalTestCase(ContextmanagerAssertionMixin, unittest.TestCase):
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def testSingleResource(self):
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cm = mock_contextmanager_generator()
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def shouldThrow():
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with cm as self.resource:
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self.assertInWithManagerInvariants(cm)
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self.assertInWithGeneratorInvariants(self.resource)
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self.raiseTestException()
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self.assertRaises(RuntimeError, shouldThrow)
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self.assertAfterWithManagerInvariantsWithError(cm)
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self.assertAfterWithGeneratorInvariantsWithError(self.resource)
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def testNestedSingleStatements(self):
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mock_a = mock_contextmanager_generator()
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mock_b = mock_contextmanager_generator()
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def shouldThrow():
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with mock_a as self.foo:
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with mock_b as self.bar:
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self.assertInWithManagerInvariants(mock_a)
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self.assertInWithManagerInvariants(mock_b)
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self.assertInWithGeneratorInvariants(self.foo)
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self.assertInWithGeneratorInvariants(self.bar)
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self.raiseTestException()
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self.assertRaises(RuntimeError, shouldThrow)
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self.assertAfterWithManagerInvariantsWithError(mock_a)
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self.assertAfterWithManagerInvariantsWithError(mock_b)
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self.assertAfterWithGeneratorInvariantsWithError(self.foo)
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self.assertAfterWithGeneratorInvariantsWithError(self.bar)
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def testMultipleResourcesInSingleStatement(self):
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cm_a = mock_contextmanager_generator()
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cm_b = mock_contextmanager_generator()
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mock_nested = MockNested(cm_a, cm_b)
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def shouldThrow():
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with mock_nested as (self.resource_a, self.resource_b):
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self.assertInWithManagerInvariants(cm_a)
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self.assertInWithManagerInvariants(cm_b)
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self.assertInWithManagerInvariants(mock_nested)
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self.assertInWithGeneratorInvariants(self.resource_a)
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self.assertInWithGeneratorInvariants(self.resource_b)
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self.raiseTestException()
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self.assertRaises(RuntimeError, shouldThrow)
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self.assertAfterWithManagerInvariantsWithError(cm_a)
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self.assertAfterWithManagerInvariantsWithError(cm_b)
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self.assertAfterWithManagerInvariantsWithError(mock_nested)
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self.assertAfterWithGeneratorInvariantsWithError(self.resource_a)
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self.assertAfterWithGeneratorInvariantsWithError(self.resource_b)
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def testNestedExceptionBeforeInnerStatement(self):
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mock_a = mock_contextmanager_generator()
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mock_b = mock_contextmanager_generator()
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self.bar = None
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def shouldThrow():
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with mock_a as self.foo:
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self.assertInWithManagerInvariants(mock_a)
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self.assertInWithGeneratorInvariants(self.foo)
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self.raiseTestException()
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with mock_b as self.bar:
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pass
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self.assertRaises(RuntimeError, shouldThrow)
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self.assertAfterWithManagerInvariantsWithError(mock_a)
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self.assertAfterWithGeneratorInvariantsWithError(self.foo)
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# The inner statement stuff should never have been touched
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self.assertEqual(self.bar, None)
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self.assertFalse(mock_b.enter_called)
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self.assertFalse(mock_b.exit_called)
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self.assertEqual(mock_b.exit_args, None)
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def testNestedExceptionAfterInnerStatement(self):
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mock_a = mock_contextmanager_generator()
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mock_b = mock_contextmanager_generator()
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def shouldThrow():
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with mock_a as self.foo:
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with mock_b as self.bar:
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self.assertInWithManagerInvariants(mock_a)
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self.assertInWithManagerInvariants(mock_b)
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self.assertInWithGeneratorInvariants(self.foo)
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self.assertInWithGeneratorInvariants(self.bar)
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self.raiseTestException()
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self.assertRaises(RuntimeError, shouldThrow)
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self.assertAfterWithManagerInvariantsWithError(mock_a)
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self.assertAfterWithManagerInvariantsNoError(mock_b)
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self.assertAfterWithGeneratorInvariantsWithError(self.foo)
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self.assertAfterWithGeneratorInvariantsNoError(self.bar)
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def testRaisedStopIteration1(self):
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# From bug 1462485
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@contextmanager
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def cm():
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yield
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def shouldThrow():
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with cm():
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raise StopIteration("from with")
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self.assertRaises(StopIteration, shouldThrow)
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def testRaisedStopIteration2(self):
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# From bug 1462485
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class cm(object):
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def __enter__(self):
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pass
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def __exit__(self, type, value, traceback):
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pass
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def shouldThrow():
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with cm():
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raise StopIteration("from with")
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self.assertRaises(StopIteration, shouldThrow)
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def testRaisedStopIteration3(self):
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# Another variant where the exception hasn't been instantiated
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# From bug 1705170
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@contextmanager
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def cm():
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yield
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def shouldThrow():
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with cm():
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raise next(iter([]))
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self.assertRaises(StopIteration, shouldThrow)
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def testRaisedGeneratorExit1(self):
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# From bug 1462485
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@contextmanager
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def cm():
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yield
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def shouldThrow():
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with cm():
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raise GeneratorExit("from with")
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self.assertRaises(GeneratorExit, shouldThrow)
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def testRaisedGeneratorExit2(self):
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# From bug 1462485
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class cm (object):
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def __enter__(self):
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pass
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def __exit__(self, type, value, traceback):
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pass
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def shouldThrow():
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with cm():
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raise GeneratorExit("from with")
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self.assertRaises(GeneratorExit, shouldThrow)
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def testErrorsInBool(self):
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# issue4589: __exit__ return code may raise an exception
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# when looking at its truth value.
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class cm(object):
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def __init__(self, bool_conversion):
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class Bool:
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def __bool__(self):
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return bool_conversion()
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self.exit_result = Bool()
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|
def __enter__(self):
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|
return 3
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|
def __exit__(self, a, b, c):
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|
return self.exit_result
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|
|
|
def trueAsBool():
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with cm(lambda: True):
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self.fail("Should NOT see this")
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trueAsBool()
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|
|
|
def falseAsBool():
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with cm(lambda: False):
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self.fail("Should raise")
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self.assertRaises(AssertionError, falseAsBool)
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|
|
|
def failAsBool():
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with cm(lambda: 1//0):
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self.fail("Should NOT see this")
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self.assertRaises(ZeroDivisionError, failAsBool)
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|
|
|
|
|
class NonLocalFlowControlTestCase(unittest.TestCase):
|
|
|
|
def testWithBreak(self):
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|
counter = 0
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|
while True:
|
|
counter += 1
|
|
with mock_contextmanager_generator():
|
|
counter += 10
|
|
break
|
|
counter += 100 # Not reached
|
|
self.assertEqual(counter, 11)
|
|
|
|
def testWithContinue(self):
|
|
counter = 0
|
|
while True:
|
|
counter += 1
|
|
if counter > 2:
|
|
break
|
|
with mock_contextmanager_generator():
|
|
counter += 10
|
|
continue
|
|
counter += 100 # Not reached
|
|
self.assertEqual(counter, 12)
|
|
|
|
def testWithReturn(self):
|
|
def foo():
|
|
counter = 0
|
|
while True:
|
|
counter += 1
|
|
with mock_contextmanager_generator():
|
|
counter += 10
|
|
return counter
|
|
counter += 100 # Not reached
|
|
self.assertEqual(foo(), 11)
|
|
|
|
def testWithYield(self):
|
|
def gen():
|
|
with mock_contextmanager_generator():
|
|
yield 12
|
|
yield 13
|
|
x = list(gen())
|
|
self.assertEqual(x, [12, 13])
|
|
|
|
def testWithRaise(self):
|
|
counter = 0
|
|
try:
|
|
counter += 1
|
|
with mock_contextmanager_generator():
|
|
counter += 10
|
|
raise RuntimeError
|
|
counter += 100 # Not reached
|
|
except RuntimeError:
|
|
self.assertEqual(counter, 11)
|
|
else:
|
|
self.fail("Didn't raise RuntimeError")
|
|
|
|
|
|
class AssignmentTargetTestCase(unittest.TestCase):
|
|
|
|
def testSingleComplexTarget(self):
|
|
targets = {1: [0, 1, 2]}
|
|
with mock_contextmanager_generator() as targets[1][0]:
|
|
self.assertEqual(list(targets.keys()), [1])
|
|
self.assertEqual(targets[1][0].__class__, MockResource)
|
|
with mock_contextmanager_generator() as list(targets.values())[0][1]:
|
|
self.assertEqual(list(targets.keys()), [1])
|
|
self.assertEqual(targets[1][1].__class__, MockResource)
|
|
with mock_contextmanager_generator() as targets[2]:
|
|
keys = list(targets.keys())
|
|
keys.sort()
|
|
self.assertEqual(keys, [1, 2])
|
|
class C: pass
|
|
blah = C()
|
|
with mock_contextmanager_generator() as blah.foo:
|
|
self.assertEqual(hasattr(blah, "foo"), True)
|
|
|
|
def testMultipleComplexTargets(self):
|
|
class C:
|
|
def __enter__(self): return 1, 2, 3
|
|
def __exit__(self, t, v, tb): pass
|
|
targets = {1: [0, 1, 2]}
|
|
with C() as (targets[1][0], targets[1][1], targets[1][2]):
|
|
self.assertEqual(targets, {1: [1, 2, 3]})
|
|
with C() as (list(targets.values())[0][2], list(targets.values())[0][1], list(targets.values())[0][0]):
|
|
self.assertEqual(targets, {1: [3, 2, 1]})
|
|
with C() as (targets[1], targets[2], targets[3]):
|
|
self.assertEqual(targets, {1: 1, 2: 2, 3: 3})
|
|
class B: pass
|
|
blah = B()
|
|
with C() as (blah.one, blah.two, blah.three):
|
|
self.assertEqual(blah.one, 1)
|
|
self.assertEqual(blah.two, 2)
|
|
self.assertEqual(blah.three, 3)
|
|
|
|
|
|
class ExitSwallowsExceptionTestCase(unittest.TestCase):
|
|
|
|
def testExitTrueSwallowsException(self):
|
|
class AfricanSwallow:
|
|
def __enter__(self): pass
|
|
def __exit__(self, t, v, tb): return True
|
|
try:
|
|
with AfricanSwallow():
|
|
1/0
|
|
except ZeroDivisionError:
|
|
self.fail("ZeroDivisionError should have been swallowed")
|
|
|
|
def testExitFalseDoesntSwallowException(self):
|
|
class EuropeanSwallow:
|
|
def __enter__(self): pass
|
|
def __exit__(self, t, v, tb): return False
|
|
try:
|
|
with EuropeanSwallow():
|
|
1/0
|
|
except ZeroDivisionError:
|
|
pass
|
|
else:
|
|
self.fail("ZeroDivisionError should have been raised")
|
|
|
|
|
|
def test_main():
|
|
run_unittest(FailureTestCase, NonexceptionalTestCase,
|
|
NestedNonexceptionalTestCase, ExceptionalTestCase,
|
|
NonLocalFlowControlTestCase,
|
|
AssignmentTargetTestCase,
|
|
ExitSwallowsExceptionTestCase)
|
|
|
|
|
|
if __name__ == '__main__':
|
|
test_main()
|