Class UnreliableArray

xarray/tests/test_backends.py:404–413

            pass

        class UnreliableArray:
            def __init__(self, array, failures=1):
                self.array = array
                self.failures = failures

            def __getitem__(self, key):
                if self.failures > 0:
                    self.failures -= 1
                    raise UnreliableArrayFailure
                return self.array[key]

        array = UnreliableArray([0])
        with pytest.raises(UnreliableArrayFailure):