def METHOD_NAME(self):
    assert_true(DotDict() == DotDict({}) == DotDict([]))
    assert_true(DotDict(a=1) == DotDict({'a': 1}) == DotDict([('a', 1)]))
    assert_true(DotDict({'a': 1}, b=2) ==
                DotDict({'a': 1, 'b': 2}) ==
                DotDict([('a', 1), ('b', 2)]))
    assert_raises(TypeError, DotDict, None)