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f54fbada41
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@ -1031,6 +1031,12 @@ patch
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default because it can be dangerous. With it switched on you can write
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passing tests against APIs that don't actually exist!
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.. note::
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.. versionchanged:: 3.5
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If you are patching builtins in a module then you don't
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need to pass `create=True`, it will be added by default.
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Patch can be used as a `TestCase` class decorator. It works by
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decorating each test method in the class. This reduces the boilerplate
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code when your test methods share a common patchings set. `patch` finds
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@ -1401,6 +1407,21 @@ It is also possible to stop all patches which have been started by using
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Stop all active patches. Only stops patches started with `start`.
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.. patch-builtins:
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patch builtins
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~~~~~~~~~~~~~~~
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You can patch any builtins within a module. The following example patches
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builtin `ord`:
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>>> @patch('__main__.ord')
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... def test(mock_ord):
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... mock_ord.return_value = 101
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... print(ord('c'))
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...
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>>> test()
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101
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TEST_PREFIX
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~~~~~~~~~~~
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@ -2011,7 +2032,7 @@ Mocking context managers with a :class:`MagicMock` is common enough and fiddly
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enough that a helper function is useful.
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>>> m = mock_open()
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>>> with patch('__main__.open', m, create=True):
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>>> with patch('__main__.open', m):
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... with open('foo', 'w') as h:
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... h.write('some stuff')
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...
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@ -2026,7 +2047,7 @@ enough that a helper function is useful.
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And for reading files:
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>>> with patch('__main__.open', mock_open(read_data='bibble'), create=True) as m:
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>>> with patch('__main__.open', mock_open(read_data='bibble')) as m:
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... with open('foo') as h:
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... result = h.read()
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...
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@ -27,9 +27,13 @@ __version__ = '1.0'
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import inspect
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import pprint
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import sys
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import builtins
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from types import ModuleType
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from functools import wraps, partial
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_builtins = {name for name in dir(builtins) if not name.startswith('_')}
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BaseExceptions = (BaseException,)
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if 'java' in sys.platform:
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# jython
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@ -1166,6 +1170,9 @@ class _patch(object):
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else:
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local = True
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if name in _builtins and isinstance(target, ModuleType):
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self.create = True
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if not self.create and original is DEFAULT:
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raise AttributeError(
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"%s does not have the attribute %r" % (target, name)
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@ -377,7 +377,7 @@ class PatchTest(unittest.TestCase):
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def test_patchobject_wont_create_by_default(self):
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try:
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@patch.object(SomeClass, 'frooble', sentinel.Frooble)
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@patch.object(SomeClass, 'ord', sentinel.Frooble)
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def test():
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self.fail('Patching non existent attributes should fail')
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@ -386,7 +386,27 @@ class PatchTest(unittest.TestCase):
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pass
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else:
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self.fail('Patching non existent attributes should fail')
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self.assertFalse(hasattr(SomeClass, 'frooble'))
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self.assertFalse(hasattr(SomeClass, 'ord'))
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def test_patch_builtins_without_create(self):
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@patch(__name__+'.ord')
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def test_ord(mock_ord):
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mock_ord.return_value = 101
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return ord('c')
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@patch(__name__+'.open')
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def test_open(mock_open):
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m = mock_open.return_value
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m.read.return_value = 'abcd'
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fobj = open('doesnotexists.txt')
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data = fobj.read()
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fobj.close()
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return data
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self.assertEqual(test_ord(), 101)
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self.assertEqual(test_open(), 'abcd')
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def test_patch_with_static_methods(self):
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