def METHOD_NAME(self):
    """
    Test :attr:`colour.algebra.extrapolation.Extrapolator.interpolator`
    property.
    """
    extrapolator = Extrapolator(
        LinearInterpolator(np.array([5, 6, 7]), np.array([5, 6, 7]))
    )
    self.assertIsInstance(extrapolator.interpolator, LinearInterpolator)