def METHOD_NAME(self):
    phase_designmatrix = self.phase_designmatrix_maker(
        self.toas, self.model, self.test_param_lite
    )
    assert phase_designmatrix.ndim == 2
    assert phase_designmatrix.shape == (
        self.toas.ntoas,
        len(self.test_param_lite) + 1,
    )
    # Test labels
    labels = phase_designmatrix.labels
    assert len(labels) == 2
    assert len(labels[0]) == 1
    assert len(labels[1]) == len(self.test_param_lite) + 1
    assert [l[0] for l in labels[1]] == ["Offset"] + self.test_param_lite