667 lines
23 KiB
Python
667 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.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], 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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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(unittest.TestCase, ContextmanagerAssertionMixin):
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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 iter([]).next()
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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 __nonzero__(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()
|
|
|
|
def falseAsBool():
|
|
with cm(lambda: False):
|
|
self.fail("Should raise")
|
|
self.assertRaises(AssertionError, falseAsBool)
|
|
|
|
def failAsBool():
|
|
with cm(lambda: 1//0):
|
|
self.fail("Should NOT see this")
|
|
self.assertRaises(ZeroDivisionError, failAsBool)
|
|
|
|
|
|
class NonLocalFlowControlTestCase(unittest.TestCase):
|
|
|
|
def testWithBreak(self):
|
|
counter = 0
|
|
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(targets.keys(), [1])
|
|
self.assertEqual(targets[1][0].__class__, MockResource)
|
|
with mock_contextmanager_generator() as targets.values()[0][1]:
|
|
self.assertEqual(targets.keys(), [1])
|
|
self.assertEqual(targets[1][1].__class__, MockResource)
|
|
with mock_contextmanager_generator() as targets[2]:
|
|
keys = 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 (targets.values()[0][2], targets.values()[0][1], 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()
|