Function test_outer_subclass_preserve

numpy/_core/tests/test_umath.py:5078–5083

(arr)

    np.matrix([[0, 1], [2, 5]]),
    ])
def test_outer_subclass_preserve(arr):
    # for gh-8661
    class foo(np.ndarray):
        pass
    actual = np.multiply.outer(arr.view(foo), arr.view(foo))
    assert actual.__class__.__name__ == 'foo'

def test_outer_bad_subclass():
    class BadArr1(np.ndarray):