Improved coverage of _typing.pxi

Author: oleksandr-pavlyk

dpctl/tests/test_usm_ndarray_ctor.py

@@ -82,6 +82,9 @@ def test_allocate_usm_ndarray(shape, usm_type):
 def test_dtypes(dtype):
     Xusm = dpt.usm_ndarray((1,), dtype=dtype)
     assert Xusm.itemsize == np.dtype(dtype).itemsize
+    expected_fmt = (np.dtype(dtype).str)[1:]
+    actual_fmt = Xusm.__sycl_usm_array_interface__["typestr"][1:]
+    assert expected_fmt == actual_fmt
 
 
 @pytest.mark.parametrize("dtype", ["", ">f4", "invalid", 123])