Method test_invalid_axis

numpy/core/tests/test_multiarray.py:5255–5257

(self)

            assert_array_equal(idx, np.lexsort((u, v)))

    def test_invalid_axis(self): # gh-7528
        x = np.linspace(0., 1., 42*3).reshape(42, 3)
        assert_raises(np.AxisError, np.lexsort, x, axis=2)

class TestIO:
    """Test tofile, fromfile, tobytes, and fromstring"""