As far as I can tell `__array_namespace__` is not being tested at all. https://github.com/search?q=repo%3Adata-apis%2Farray-api-tests%20__array_namespace__&type=code
As far as I can tell
__array_namespace__is not being tested at all. https://github.com/search?q=repo%3Adata-apis%2Farray-api-tests%20__array_namespace__&type=code