Added test to cover usage from gh-998, and extended checks for

invalid/unsupported data types.

Author: oleksandr-pavlyk

dpctl/tests/test_usm_ndarray_ctor.py

@@ -95,13 +95,23 @@ def test_dtypes(dtype):
     assert expected_fmt == actual_fmt
 
 
-@pytest.mark.parametrize("dtype", ["", ">f4", "invalid", 123])
+@pytest.mark.parametrize(
+    "dtype",
+    [
+        "",
+        ">f4",
+        "invalid",
+        123,
+        np.dtype(">f4"),
+        np.dtype([("a", ">f4"), ("b", "i4")]),
+    ],
+)
 def test_dtypes_invalid(dtype):
     with pytest.raises((TypeError, ValueError)):
         dpt.usm_ndarray((1,), dtype=dtype)
 
 
-@pytest.mark.parametrize("dt", ["d", "c16"])
+@pytest.mark.parametrize("dt", ["f", "c8"])
 def test_properties(dt):
     """
     Test that properties execute
@@ -1181,6 +1191,11 @@ def test_empty_like(dt, usm_kind):
     assert X.sycl_queue == Y.sycl_queue
 
 
+def test_empty_unexpected_data_type():
+    with pytest.raises(TypeError):
+        dpt.empty(1, dtype=np.object_)
+
+
 @pytest.mark.parametrize(
     "dt",
     _all_dtypes,