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import unittest
from unittest import mock
class SampleObject:
def method_sample1(self): pass
def method_sample2(self): pass
class TestSealable(unittest.TestCase):
def test_attributes_return_more_mocks_by_default(self):
m = mock.Mock()
self.assertIsInstance(m.test, mock.Mock)
self.assertIsInstance(m.test(), mock.Mock)
self.assertIsInstance(m.test().test2(), mock.Mock)
def test_new_attributes_cannot_be_accessed_on_seal(self):
m = mock.Mock()
mock.seal(m)
with self.assertRaises(AttributeError):
m.test
with self.assertRaises(AttributeError):
m()
def test_new_attributes_cannot_be_set_on_seal(self):
m = mock.Mock()
mock.seal(m)
with self.assertRaises(AttributeError):
m.test = 1
def test_existing_attributes_can_be_set_on_seal(self):
m = mock.Mock()
m.test.test2 = 1
mock.seal(m)
m.test.test2 = 2
self.assertEqual(m.test.test2, 2)
def test_new_attributes_cannot_be_set_on_child_of_seal(self):
m = mock.Mock()
m.test.test2 = 1
mock.seal(m)
with self.assertRaises(AttributeError):
m.test.test3 = 1
def test_existing_attributes_allowed_after_seal(self):
m = mock.Mock()
m.test.return_value = 3
mock.seal(m)
self.assertEqual(m.test(), 3)
def test_initialized_attributes_allowed_after_seal(self):
m = mock.Mock(test_value=1)
mock.seal(m)
self.assertEqual(m.test_value, 1)
def test_call_on_sealed_mock_fails(self):
m = mock.Mock()
mock.seal(m)
with self.assertRaises(AttributeError):
m()
def test_call_on_defined_sealed_mock_succeeds(self):
m = mock.Mock(return_value=5)
mock.seal(m)
self.assertEqual(m(), 5)
def test_seals_recurse_on_added_attributes(self):
m = mock.Mock()
m.test1.test2().test3 = 4
mock.seal(m)
self.assertEqual(m.test1.test2().test3, 4)
with self.assertRaises(AttributeError):
m.test1.test2().test4
with self.assertRaises(AttributeError):
m.test1.test3
def test_seals_recurse_on_magic_methods(self):
m = mock.MagicMock()
m.test1.test2["a"].test3 = 4
m.test1.test3[2:5].test3 = 4
mock.seal(m)
self.assertEqual(m.test1.test2["a"].test3, 4)
self.assertEqual(m.test1.test2[2:5].test3, 4)
with self.assertRaises(AttributeError):
m.test1.test2["a"].test4
with self.assertRaises(AttributeError):
m.test1.test3[2:5].test4
def test_seals_dont_recurse_on_manual_attributes(self):
m = mock.Mock(name="root_mock")
m.test1.test2 = mock.Mock(name="not_sealed")
m.test1.test2.test3 = 4
mock.seal(m)
self.assertEqual(m.test1.test2.test3, 4)
m.test1.test2.test4 # Does not raise
m.test1.test2.test4 = 1 # Does not raise
def test_integration_with_spec_att_definition(self):
"""You are not restricted when using mock with spec"""
m = mock.Mock(SampleObject)
m.attr_sample1 = 1
m.attr_sample3 = 3
mock.seal(m)
self.assertEqual(m.attr_sample1, 1)
self.assertEqual(m.attr_sample3, 3)
with self.assertRaises(AttributeError):
m.attr_sample2
def test_integration_with_spec_method_definition(self):
"""You need to define the methods, even if they are in the spec"""
m = mock.Mock(SampleObject)
m.method_sample1.return_value = 1
mock.seal(m)
self.assertEqual(m.method_sample1(), 1)
with self.assertRaises(AttributeError):
m.method_sample2()
def test_integration_with_spec_method_definition_respects_spec(self):
"""You cannot define methods out of the spec"""
m = mock.Mock(SampleObject)
with self.assertRaises(AttributeError):
m.method_sample3.return_value = 3
def test_sealed_exception_has_attribute_name(self):
m = mock.Mock()
mock.seal(m)
with self.assertRaises(AttributeError) as cm:
m.SECRETE_name
self.assertIn("SECRETE_name", str(cm.exception))
def test_attribute_chain_is_maintained(self):
m = mock.Mock(name="mock_name")
m.test1.test2.test3.test4
mock.seal(m)
with self.assertRaises(AttributeError) as cm:
m.test1.test2.test3.test4.boom
self.assertIn("mock_name.test1.test2.test3.test4.boom", str(cm.exception))
def test_call_chain_is_maintained(self):
m = mock.Mock()
m.test1().test2.test3().test4
mock.seal(m)
with self.assertRaises(AttributeError) as cm:
m.test1().test2.test3().test4()
self.assertIn("mock.test1().test2.test3().test4", str(cm.exception))
def test_seal_with_autospec(self):
# https://bugs.python.org/issue45156
class Foo:
foo = 0
def bar1(self):
return 1
def bar2(self):
return 2
class Baz:
baz = 3
def ban(self):
return 4
for spec_set in (True, False):
with self.subTest(spec_set=spec_set):
foo = mock.create_autospec(Foo, spec_set=spec_set)
foo.bar1.return_value = 'a'
foo.Baz.ban.return_value = 'b'
mock.seal(foo)
self.assertIsInstance(foo.foo, mock.NonCallableMagicMock)
self.assertIsInstance(foo.bar1, mock.MagicMock)
self.assertIsInstance(foo.bar2, mock.MagicMock)
self.assertIsInstance(foo.Baz, mock.MagicMock)
self.assertIsInstance(foo.Baz.baz, mock.NonCallableMagicMock)
self.assertIsInstance(foo.Baz.ban, mock.MagicMock)
self.assertEqual(foo.bar1(), 'a')
foo.bar1.return_value = 'new_a'
self.assertEqual(foo.bar1(), 'new_a')
self.assertEqual(foo.Baz.ban(), 'b')
foo.Baz.ban.return_value = 'new_b'
self.assertEqual(foo.Baz.ban(), 'new_b')
with self.assertRaises(TypeError):
foo.foo()
with self.assertRaises(AttributeError):
foo.bar = 1
with self.assertRaises(AttributeError):
foo.bar2()
foo.bar2.return_value = 'bar2'
self.assertEqual(foo.bar2(), 'bar2')
with self.assertRaises(AttributeError):
foo.missing_attr
with self.assertRaises(AttributeError):
foo.missing_attr = 1
with self.assertRaises(AttributeError):
foo.missing_method()
with self.assertRaises(TypeError):
foo.Baz.baz()
with self.assertRaises(AttributeError):
foo.Baz.missing_attr
with self.assertRaises(AttributeError):
foo.Baz.missing_attr = 1
with self.assertRaises(AttributeError):
foo.Baz.missing_method()
if __name__ == "__main__":
unittest.main()
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