Add tests for positional-only keywords in astype

Author: antonwolfy

dpnp/tests/test_arraycreation.py

@@ -10,6 +10,7 @@
     assert_array_equal,
     assert_equal,
     assert_raises,
+    assert_raises_regex,
 )
 
 import dpnp
@@ -57,6 +58,28 @@ def test_error(self):
         assert_raises(TypeError, dpnp.array, x, ndmin=3.0)
 
 
+class TestAsType:
+    @testing.with_requires("numpy>=2.0")
+    @pytest.mark.parametrize("xp", [dpnp, numpy])
+    def test_validate_positional_args(self, xp):
+        x = xp.ones(4)
+        assert_raises_regex(
+            TypeError,
+            "got some positional-only arguments passed as keyword arguments",
+            xp.astype,
+            x,
+            dtype="f4",
+        )
+        assert_raises_regex(
+            TypeError,
+            "takes 2 positional arguments but 3 were given",
+            xp.astype,
+            x,
+            "f4",
+            None,
+        )
+
+
 class TestTrace:
     @pytest.mark.parametrize("a_sh", [(3, 4), (2, 2, 2)])
     @pytest.mark.parametrize(

dpnp/tests/test_ndarray.py

@@ -38,7 +38,7 @@ def test_basic(self, arr, arr_dtype, res_dtype):
         assert_allclose(expected, result)
 
     def test_subok_error(self):
-        x = dpnp.ones((4))
+        x = dpnp.ones(4)
         with pytest.raises(NotImplementedError):
             x.astype("i4", subok=False)