__________________ TestUfunc.test_array_wrap_array_priority ___________________

self = <test_ufunc.TestUfunc object at 0x0000037C444DA740>

    def test_array_wrap_array_priority(self):
        class ArrayPriorityBase(np.ndarray):
            @classmethod
            def __array_wrap__(cls, array, context=None, return_scalar=False):
                return cls
    
        class ArrayPriorityMinus0(ArrayPriorityBase):
            __array_priority__ = 0
    
        class ArrayPriorityMinus1000(ArrayPriorityBase):
            __array_priority__ = -1000
    
        class ArrayPriorityMinus1000b(ArrayPriorityBase):
            __array_priority__ = -1000
    
        class ArrayPriorityMinus2000(ArrayPriorityBase):
            __array_priority__ = -2000
    
        x = np.ones(2).view(ArrayPriorityMinus1000)
        xb = np.ones(2).view(ArrayPriorityMinus1000b)
        y = np.ones(2).view(ArrayPriorityMinus2000)
    
        assert np.add(x, y) is ArrayPriorityMinus1000
        assert np.add(y, x) is ArrayPriorityMinus1000
        assert np.add(x, xb) is ArrayPriorityMinus1000
        assert np.add(xb, x) is ArrayPriorityMinus1000b
>       assert np.add(np.zeros(2), ArrayPriorityMinus0(2)) is ArrayPriorityMinus0
E       RuntimeWarning: invalid value encountered in add