test: add test for structured dtype properties

Author: cpcloud

cuda_core/tests/test_utils.py

@@ -430,3 +430,20 @@ def test_view_zero_size_array(api, shape, dtype):
     assert smv.size == 0
     assert smv.shape == shape
     assert smv.dtype == np.dtype(dtype)
+
+
+def test_struct_array():
+    cp = pytest.importorskip("cupy")
+
+    x = np.array([(1.0, 2), (2.0, 3)], dtype=[("array1", np.float64), ("array2", np.int64)])
+
+    y = cp.empty(2, dtype=x.dtype)
+    y.set(x)
+
+    smv = StridedMemoryView.from_cuda_array_interface(y, stream_ptr=0)
+    assert smv.size * smv.dtype.itemsize == x.nbytes
+    assert smv.size == x.size
+    assert smv.shape == x.shape
+    # full dtype information doesn't seem to be preserved due to use of type strings,
+    # which are lossy, e.g., dtype([("a", "int")]).str == "V8"
+    assert smv.dtype == np.dtype(f"V{x.itemsize}")