Method test_update

Lib/test/mapping_tests.py:384–428

(self)

        self.assertRaises(TypeError, d.clear, None)

    def test_update(self):
        BasicTestMappingProtocol.test_update(self)
        # mapping argument
        d = self._empty_mapping()
        d.update({1:100})
        d.update({2:20})
        d.update({1:1, 2:2, 3:3})
        self.assertEqual(d, {1:1, 2:2, 3:3})

        # no argument
        d.update()
        self.assertEqual(d, {1:1, 2:2, 3:3})

        # keyword arguments
        d = self._empty_mapping()
        d.update(x=100)
        d.update(y=20)
        d.update(x=1, y=2, z=3)
        self.assertEqual(d, {"x":1, "y":2, "z":3})

        # item sequence
        d = self._empty_mapping()
        d.update([("x", 100), ("y", 20)])
        self.assertEqual(d, {"x":100, "y":20})

        # Both item sequence and keyword arguments
        d = self._empty_mapping()
        d.update([("x", 100), ("y", 20)], x=1, y=2)
        self.assertEqual(d, {"x":1, "y":2})

        # iterator
        d = self._full_mapping({1:3, 2:4})
        d.update(self._full_mapping({1:2, 3:4, 5:6}).items())
        self.assertEqual(d, {1:2, 2:4, 3:4, 5:6})

        class SimpleUserDict:
            def __init__(self):
                self.d = {1:1, 2:2, 3:3}
            def keys(self):
                return self.d.keys()
            def __getitem__(self, i):
                return self.d[i]
        d.clear()
        d.update(SimpleUserDict())
        self.assertEqual(d, {1:1, 2:2, 3:3})

    def test_fromkeys(self):
        self.assertEqual(self.type2test.fromkeys('abc'), {'a':None, 'b':None, 'c':None})