'Test conversion from any unit to same unit.'

def test_convert_same_unit(self):

    self.assertEqual(5, distance_util.convert(5, LENGTH_KILOMETERS, LENGTH_KILOMETERS))
    self.assertEqual(2, distance_util.convert(2, LENGTH_METERS, LENGTH_METERS))
    self.assertEqual(10, distance_util.convert(10, LENGTH_MILES, LENGTH_MILES))
    self.assertEqual(9, distance_util.convert(9, LENGTH_FEET, LENGTH_FEET))
