def test__rsub__(self):
        """Test reverse subtraction operation on a variable."""
        v1 = backend.Variable(initializer=np.array([4.0, 5.0, 6.0]))
        v2 = backend.Variable(initializer=np.array([1.0, 2.0, 3.0]))
        self.assertAllClose(v1.__rsub__(v2), np.array([-3.0, -3.0, -3.0]))
Test reverse subtraction operation on a variable.
keras/src/backend/common/variables_test.py