🧪 add (failing) numpy integration test for HasArrayNamespace

Author: jorenham

tests/integration/test_numpy.pyi

@@ -0,0 +1,15 @@
+from typing import Any, TypeVar
+
+import numpy.typing as npt
+
+import array_api_typing as xpt
+
+_T = TypeVar("_T", bound=npt.NDArray[Any])
+
+def get_namespace(obj: xpt.HasArrayNamespace[_T], /) -> _T: ...
+
+###
+# Ensure that `np.ndarray` instances are assignable to `xpt.HasArrayNamespace`.
+
+arr: npt.NDArray[Any]
+arr_namespace: xpt.HasArrayNamespace[Any] = arr