def METHOD_NAME(self):
    """Initialise the common tests attributes."""
    self._lut_operator_matrix = LUTOperatorMatrix(
        np.linspace(0, 1, 16).reshape([4, 4]),
        offset=np.array([0.25, 0.5, 0.75, 1.0]),
        name="Nemo Matrix",
        comments=["A first comment.", "A second comment."],
    )