def test_can_update_rvalue(self):
file_ = File()
file_._rvalue = 2.5
file_.rvalue = 1.9
self.assertEqual(file_._rvalue, 1.9)
def test_can_get_rvalue(self):
file_ = File()
file_._rvalue = 2.5
self.assertIs(file_._rvalue, file_.rvalue)