PEP 417: Adding unittest.mock
diff --git a/Lib/unittest/test/testmock/testwith.py b/Lib/unittest/test/testmock/testwith.py
new file mode 100644
index 0000000..0a0cfad
--- /dev/null
+++ b/Lib/unittest/test/testmock/testwith.py
@@ -0,0 +1,176 @@
+import unittest
+from warnings import catch_warnings
+
+from unittest.test.testmock.support import is_instance
+from unittest.mock import MagicMock, Mock, patch, sentinel, mock_open, call
+
+
+
+something = sentinel.Something
+something_else = sentinel.SomethingElse
+
+
+
+class WithTest(unittest.TestCase):
+
+ def test_with_statement(self):
+ with patch('%s.something' % __name__, sentinel.Something2):
+ self.assertEqual(something, sentinel.Something2, "unpatched")
+ self.assertEqual(something, sentinel.Something)
+
+
+ def test_with_statement_exception(self):
+ try:
+ with patch('%s.something' % __name__, sentinel.Something2):
+ self.assertEqual(something, sentinel.Something2, "unpatched")
+ raise Exception('pow')
+ except Exception:
+ pass
+ else:
+ self.fail("patch swallowed exception")
+ self.assertEqual(something, sentinel.Something)
+
+
+ def test_with_statement_as(self):
+ with patch('%s.something' % __name__) as mock_something:
+ self.assertEqual(something, mock_something, "unpatched")
+ self.assertTrue(is_instance(mock_something, MagicMock),
+ "patching wrong type")
+ self.assertEqual(something, sentinel.Something)
+
+
+ def test_patch_object_with_statement(self):
+ class Foo(object):
+ something = 'foo'
+ original = Foo.something
+ with patch.object(Foo, 'something'):
+ self.assertNotEqual(Foo.something, original, "unpatched")
+ self.assertEqual(Foo.something, original)
+
+
+ def test_with_statement_nested(self):
+ with catch_warnings(record=True):
+ with patch('%s.something' % __name__) as mock_something, patch('%s.something_else' % __name__) as mock_something_else:
+ self.assertEqual(something, mock_something, "unpatched")
+ self.assertEqual(something_else, mock_something_else,
+ "unpatched")
+
+ self.assertEqual(something, sentinel.Something)
+ self.assertEqual(something_else, sentinel.SomethingElse)
+
+
+ def test_with_statement_specified(self):
+ with patch('%s.something' % __name__, sentinel.Patched) as mock_something:
+ self.assertEqual(something, mock_something, "unpatched")
+ self.assertEqual(mock_something, sentinel.Patched, "wrong patch")
+ self.assertEqual(something, sentinel.Something)
+
+
+ def testContextManagerMocking(self):
+ mock = Mock()
+ mock.__enter__ = Mock()
+ mock.__exit__ = Mock()
+ mock.__exit__.return_value = False
+
+ with mock as m:
+ self.assertEqual(m, mock.__enter__.return_value)
+ mock.__enter__.assert_called_with()
+ mock.__exit__.assert_called_with(None, None, None)
+
+
+ def test_context_manager_with_magic_mock(self):
+ mock = MagicMock()
+
+ with self.assertRaises(TypeError):
+ with mock:
+ 'foo' + 3
+ mock.__enter__.assert_called_with()
+ self.assertTrue(mock.__exit__.called)
+
+
+ def test_with_statement_same_attribute(self):
+ with patch('%s.something' % __name__, sentinel.Patched) as mock_something:
+ self.assertEqual(something, mock_something, "unpatched")
+
+ with patch('%s.something' % __name__) as mock_again:
+ self.assertEqual(something, mock_again, "unpatched")
+
+ self.assertEqual(something, mock_something,
+ "restored with wrong instance")
+
+ self.assertEqual(something, sentinel.Something, "not restored")
+
+
+ def test_with_statement_imbricated(self):
+ with patch('%s.something' % __name__) as mock_something:
+ self.assertEqual(something, mock_something, "unpatched")
+
+ with patch('%s.something_else' % __name__) as mock_something_else:
+ self.assertEqual(something_else, mock_something_else,
+ "unpatched")
+
+ self.assertEqual(something, sentinel.Something)
+ self.assertEqual(something_else, sentinel.SomethingElse)
+
+
+ def test_dict_context_manager(self):
+ foo = {}
+ with patch.dict(foo, {'a': 'b'}):
+ self.assertEqual(foo, {'a': 'b'})
+ self.assertEqual(foo, {})
+
+ with self.assertRaises(NameError):
+ with patch.dict(foo, {'a': 'b'}):
+ self.assertEqual(foo, {'a': 'b'})
+ raise NameError('Konrad')
+
+ self.assertEqual(foo, {})
+
+
+
+class TestMockOpen(unittest.TestCase):
+
+ def test_mock_open(self):
+ mock = mock_open()
+ with patch('%s.open' % __name__, mock, create=True) as patched:
+ self.assertIs(patched, mock)
+ open('foo')
+
+ mock.assert_called_once_with('foo')
+
+
+ def test_mock_open_context_manager(self):
+ mock = mock_open()
+ handle = mock.return_value
+ with patch('%s.open' % __name__, mock, create=True):
+ with open('foo') as f:
+ f.read()
+
+ expected_calls = [call('foo'), call().__enter__(), call().read(),
+ call().__exit__(None, None, None)]
+ self.assertEqual(mock.mock_calls, expected_calls)
+ self.assertIs(f, handle)
+
+
+ def test_explicit_mock(self):
+ mock = MagicMock()
+ mock_open(mock)
+
+ with patch('%s.open' % __name__, mock, create=True) as patched:
+ self.assertIs(patched, mock)
+ open('foo')
+
+ mock.assert_called_once_with('foo')
+
+
+ def test_read_data(self):
+ mock = mock_open(read_data='foo')
+ with patch('%s.open' % __name__, mock, create=True):
+ h = open('bar')
+ result = h.read()
+
+ self.assertEqual(result, 'foo')
+
+
+if __name__ == '__main__':
+ unittest.main()