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403 lines
12 KiB
Python
403 lines
12 KiB
Python
import unittest
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import inspect
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import sys
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from unittest.mock import Mock, MagicMock, _magics
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class TestMockingMagicMethods(unittest.TestCase):
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def test_deleting_magic_methods(self):
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mock = Mock()
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self.assertFalse(hasattr(mock, '__getitem__'))
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mock.__getitem__ = Mock()
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self.assertTrue(hasattr(mock, '__getitem__'))
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del mock.__getitem__
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self.assertFalse(hasattr(mock, '__getitem__'))
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def test_magicmock_del(self):
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mock = MagicMock()
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# before using getitem
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del mock.__getitem__
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self.assertRaises(TypeError, lambda: mock['foo'])
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mock = MagicMock()
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# this time use it first
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mock['foo']
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del mock.__getitem__
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self.assertRaises(TypeError, lambda: mock['foo'])
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def test_magic_method_wrapping(self):
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mock = Mock()
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def f(self, name):
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return self, 'fish'
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mock.__getitem__ = f
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self.assertFalse(mock.__getitem__ is f)
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self.assertEqual(mock['foo'], (mock, 'fish'))
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self.assertEqual(mock.__getitem__('foo'), (mock, 'fish'))
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mock.__getitem__ = mock
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self.assertTrue(mock.__getitem__ is mock)
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def test_magic_methods_isolated_between_mocks(self):
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mock1 = Mock()
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mock2 = Mock()
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mock1.__iter__ = Mock(return_value=iter([]))
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self.assertEqual(list(mock1), [])
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self.assertRaises(TypeError, lambda: list(mock2))
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def test_repr(self):
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mock = Mock()
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self.assertEqual(repr(mock), "<Mock id='%s'>" % id(mock))
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mock.__repr__ = lambda s: 'foo'
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self.assertEqual(repr(mock), 'foo')
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def test_str(self):
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mock = Mock()
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self.assertEqual(str(mock), object.__str__(mock))
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mock.__str__ = lambda s: 'foo'
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self.assertEqual(str(mock), 'foo')
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def test_dict_methods(self):
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mock = Mock()
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self.assertRaises(TypeError, lambda: mock['foo'])
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def _del():
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del mock['foo']
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def _set():
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mock['foo'] = 3
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self.assertRaises(TypeError, _del)
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self.assertRaises(TypeError, _set)
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_dict = {}
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def getitem(s, name):
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return _dict[name]
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def setitem(s, name, value):
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_dict[name] = value
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def delitem(s, name):
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del _dict[name]
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mock.__setitem__ = setitem
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mock.__getitem__ = getitem
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mock.__delitem__ = delitem
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self.assertRaises(KeyError, lambda: mock['foo'])
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mock['foo'] = 'bar'
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self.assertEqual(_dict, {'foo': 'bar'})
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self.assertEqual(mock['foo'], 'bar')
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del mock['foo']
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self.assertEqual(_dict, {})
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def test_numeric(self):
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original = mock = Mock()
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mock.value = 0
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self.assertRaises(TypeError, lambda: mock + 3)
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def add(self, other):
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mock.value += other
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return self
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mock.__add__ = add
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self.assertEqual(mock + 3, mock)
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self.assertEqual(mock.value, 3)
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del mock.__add__
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def iadd(mock):
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mock += 3
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self.assertRaises(TypeError, iadd, mock)
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mock.__iadd__ = add
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mock += 6
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self.assertEqual(mock, original)
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self.assertEqual(mock.value, 9)
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self.assertRaises(TypeError, lambda: 3 + mock)
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mock.__radd__ = add
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self.assertEqual(7 + mock, mock)
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self.assertEqual(mock.value, 16)
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def test_hash(self):
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mock = Mock()
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# test delegation
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self.assertEqual(hash(mock), Mock.__hash__(mock))
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def _hash(s):
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return 3
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mock.__hash__ = _hash
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self.assertEqual(hash(mock), 3)
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def test_nonzero(self):
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m = Mock()
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self.assertTrue(bool(m))
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m.__bool__ = lambda s: False
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self.assertFalse(bool(m))
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def test_comparison(self):
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mock = Mock()
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def comp(s, o):
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return True
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mock.__lt__ = mock.__gt__ = mock.__le__ = mock.__ge__ = comp
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self. assertTrue(mock < 3)
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self. assertTrue(mock > 3)
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self. assertTrue(mock <= 3)
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self. assertTrue(mock >= 3)
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self.assertRaises(TypeError, lambda: MagicMock() < object())
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self.assertRaises(TypeError, lambda: object() < MagicMock())
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self.assertRaises(TypeError, lambda: MagicMock() < MagicMock())
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self.assertRaises(TypeError, lambda: MagicMock() > object())
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self.assertRaises(TypeError, lambda: object() > MagicMock())
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self.assertRaises(TypeError, lambda: MagicMock() > MagicMock())
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self.assertRaises(TypeError, lambda: MagicMock() <= object())
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self.assertRaises(TypeError, lambda: object() <= MagicMock())
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self.assertRaises(TypeError, lambda: MagicMock() <= MagicMock())
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self.assertRaises(TypeError, lambda: MagicMock() >= object())
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self.assertRaises(TypeError, lambda: object() >= MagicMock())
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self.assertRaises(TypeError, lambda: MagicMock() >= MagicMock())
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def test_equality(self):
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for mock in Mock(), MagicMock():
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self.assertEqual(mock == mock, True)
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self.assertIsInstance(mock == mock, bool)
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self.assertEqual(mock != mock, False)
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self.assertIsInstance(mock != mock, bool)
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self.assertEqual(mock == object(), False)
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self.assertEqual(mock != object(), True)
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def eq(self, other):
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return other == 3
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mock.__eq__ = eq
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self.assertTrue(mock == 3)
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self.assertFalse(mock == 4)
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def ne(self, other):
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return other == 3
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mock.__ne__ = ne
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self.assertTrue(mock != 3)
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self.assertFalse(mock != 4)
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mock = MagicMock()
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mock.__eq__.return_value = True
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self.assertIsInstance(mock == 3, bool)
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self.assertEqual(mock == 3, True)
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mock.__ne__.return_value = False
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self.assertIsInstance(mock != 3, bool)
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self.assertEqual(mock != 3, False)
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def test_len_contains_iter(self):
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mock = Mock()
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self.assertRaises(TypeError, len, mock)
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self.assertRaises(TypeError, iter, mock)
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self.assertRaises(TypeError, lambda: 'foo' in mock)
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mock.__len__ = lambda s: 6
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self.assertEqual(len(mock), 6)
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mock.__contains__ = lambda s, o: o == 3
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self.assertTrue(3 in mock)
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self.assertFalse(6 in mock)
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mock.__iter__ = lambda s: iter('foobarbaz')
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self.assertEqual(list(mock), list('foobarbaz'))
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def test_magicmock(self):
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mock = MagicMock()
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mock.__iter__.return_value = iter([1, 2, 3])
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self.assertEqual(list(mock), [1, 2, 3])
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getattr(mock, '__bool__').return_value = False
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self.assertFalse(hasattr(mock, '__nonzero__'))
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self.assertFalse(bool(mock))
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for entry in _magics:
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self.assertTrue(hasattr(mock, entry))
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self.assertFalse(hasattr(mock, '__imaginery__'))
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def test_magic_mock_equality(self):
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mock = MagicMock()
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self.assertIsInstance(mock == object(), bool)
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self.assertIsInstance(mock != object(), bool)
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self.assertEqual(mock == object(), False)
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self.assertEqual(mock != object(), True)
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self.assertEqual(mock == mock, True)
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self.assertEqual(mock != mock, False)
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def test_magicmock_defaults(self):
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mock = MagicMock()
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self.assertEqual(int(mock), 1)
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self.assertEqual(complex(mock), 1j)
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self.assertEqual(float(mock), 1.0)
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self.assertNotIn(object(), mock)
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self.assertEqual(len(mock), 0)
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self.assertEqual(list(mock), [])
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self.assertEqual(hash(mock), object.__hash__(mock))
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self.assertEqual(str(mock), object.__str__(mock))
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self.assertTrue(bool(mock))
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# in Python 3 oct and hex use __index__
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# so these tests are for __index__ in py3k
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self.assertEqual(oct(mock), '0o1')
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self.assertEqual(hex(mock), '0x1')
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# how to test __sizeof__ ?
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def test_magic_methods_and_spec(self):
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class Iterable(object):
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def __iter__(self):
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pass
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mock = Mock(spec=Iterable)
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self.assertRaises(AttributeError, lambda: mock.__iter__)
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mock.__iter__ = Mock(return_value=iter([]))
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self.assertEqual(list(mock), [])
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class NonIterable(object):
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pass
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mock = Mock(spec=NonIterable)
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self.assertRaises(AttributeError, lambda: mock.__iter__)
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def set_int():
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mock.__int__ = Mock(return_value=iter([]))
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self.assertRaises(AttributeError, set_int)
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mock = MagicMock(spec=Iterable)
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self.assertEqual(list(mock), [])
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self.assertRaises(AttributeError, set_int)
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def test_magic_methods_and_spec_set(self):
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class Iterable(object):
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def __iter__(self):
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pass
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mock = Mock(spec_set=Iterable)
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self.assertRaises(AttributeError, lambda: mock.__iter__)
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mock.__iter__ = Mock(return_value=iter([]))
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self.assertEqual(list(mock), [])
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class NonIterable(object):
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pass
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mock = Mock(spec_set=NonIterable)
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self.assertRaises(AttributeError, lambda: mock.__iter__)
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def set_int():
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mock.__int__ = Mock(return_value=iter([]))
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self.assertRaises(AttributeError, set_int)
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mock = MagicMock(spec_set=Iterable)
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self.assertEqual(list(mock), [])
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self.assertRaises(AttributeError, set_int)
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def test_setting_unsupported_magic_method(self):
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mock = MagicMock()
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def set_setattr():
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mock.__setattr__ = lambda self, name: None
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self.assertRaisesRegex(AttributeError,
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"Attempting to set unsupported magic method '__setattr__'.",
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set_setattr
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)
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def test_attributes_and_return_value(self):
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mock = MagicMock()
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attr = mock.foo
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def _get_type(obj):
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# the type of every mock (or magicmock) is a custom subclass
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# so the real type is the second in the mro
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return type(obj).__mro__[1]
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self.assertEqual(_get_type(attr), MagicMock)
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returned = mock()
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self.assertEqual(_get_type(returned), MagicMock)
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def test_magic_methods_are_magic_mocks(self):
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mock = MagicMock()
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self.assertIsInstance(mock.__getitem__, MagicMock)
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mock[1][2].__getitem__.return_value = 3
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self.assertEqual(mock[1][2][3], 3)
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def test_magic_method_reset_mock(self):
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mock = MagicMock()
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str(mock)
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self.assertTrue(mock.__str__.called)
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mock.reset_mock()
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self.assertFalse(mock.__str__.called)
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def test_dir(self):
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# overriding the default implementation
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for mock in Mock(), MagicMock():
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def _dir(self):
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return ['foo']
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mock.__dir__ = _dir
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self.assertEqual(dir(mock), ['foo'])
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@unittest.skipIf('PyPy' in sys.version, "This fails differently on pypy")
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def test_bound_methods(self):
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m = Mock()
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# XXXX should this be an expected failure instead?
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# this seems like it should work, but is hard to do without introducing
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# other api inconsistencies. Failure message could be better though.
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m.__iter__ = [3].__iter__
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self.assertRaises(TypeError, iter, m)
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def test_magic_method_type(self):
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class Foo(MagicMock):
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pass
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foo = Foo()
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self.assertIsInstance(foo.__int__, Foo)
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def test_descriptor_from_class(self):
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m = MagicMock()
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type(m).__str__.return_value = 'foo'
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self.assertEqual(str(m), 'foo')
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def test_iterable_as_iter_return_value(self):
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m = MagicMock()
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m.__iter__.return_value = [1, 2, 3]
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self.assertEqual(list(m), [1, 2, 3])
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self.assertEqual(list(m), [1, 2, 3])
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m.__iter__.return_value = iter([4, 5, 6])
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self.assertEqual(list(m), [4, 5, 6])
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self.assertEqual(list(m), [])
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if __name__ == '__main__':
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unittest.main()
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