def mock_add_spec(self, spec, spec_set=False):
self._mock_add_spec(spec, spec_set)<EOL>self._mock_set_magics()<EOL>
Add a spec to a mock. `spec` can either be an object or a
        list of strings. Only attributes on the `spec` can be fetched as
        attributes from the mock.

        If `spec_set` is True then only attributes on the spec can be set.