TST: Expand the __class_getitem__ test coverage for python 3.8

Author: BvB93

numpy/core/tests/test_arraymethod.py

@@ -85,3 +85,10 @@ def test_subscript_tuple(self, arg_len: int) -> None:
     def test_subscript_scalar(self) -> None:
         with pytest.raises(TypeError):
             np.ndarray[Any]
+
+
+@pytest.mark.skipif(sys.version_info >= (3, 9), reason="Requires python 3.8")
+def test_class_getitem_38() -> None:
+    match = "Type subscription requires python >= 3.9"
+    with pytest.raises(TypeError, match=match):
+        np.ndarray[Any, Any]

numpy/core/tests/test_dtype.py

@@ -1578,3 +1578,10 @@ def test_subscript_tuple(self, arg_len: int) -> None:
 
     def test_subscript_scalar(self) -> None:
         assert np.dtype[Any]
+
+
+@pytest.mark.skipif(sys.version_info >= (3, 9), reason="Requires python 3.8")
+def test_class_getitem_38() -> None:
+    match = "Type subscription requires python >= 3.9"
+    with pytest.raises(TypeError, match=match):
+        np.dtype[Any]

numpy/core/tests/test_scalar_methods.py

@@ -171,3 +171,11 @@ def test_subscript_tuple(self, arg_len: int) -> None:
 
     def test_subscript_scalar(self) -> None:
         assert np.number[Any]
+
+
+@pytest.mark.skipif(sys.version_info >= (3, 9), reason="Requires python 3.8")
+@pytest.mark.parametrize("cls", [np.number, np.int64])
+def test_class_getitem_38(cls: Type[np.number]) -> None:
+    match = "Type subscription requires python >= 3.9"
+    with pytest.raises(TypeError, match=match):
+        cls[Any]