def test_headingWithoutVariationRepr(self):
        """
        A repr of a heading with no variation reports its value and that the
        variation is unknown.
        """
        heading = base.Heading(1.)
        expectedRepr = "<Heading (1.0 degrees, unknown variation)>"
        self.assertEqual(repr(heading), expectedRepr)

        A repr of a heading with no variation reports its value and that the
        variation is unknown.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/positioning/test/test_base.py