Add test for legacy container holding numpy's array.

Author: oleksandr-pavlyk

dpctl/tests/test_usm_ndarray_dlpack.py

@@ -788,6 +788,25 @@ def test_generic_container_legacy():
     assert Z.device == X.device
 
 
+def test_generic_container_legacy_np():
+    get_queue_or_skip()
+    C = LegacyContainer(np.linspace(0, 100, num=20, dtype="int16"))
+
+    X = dpt.from_dlpack(C)
+    assert isinstance(X, np.ndarray)
+    assert X.ctypes.data == C._array.ctypes.data
+    assert X.dtype == C._array.dtype
+
+    Y = dpt.from_dlpack(C, device=(dpt.DLDeviceType.kDLCPU, 0))
+    assert isinstance(Y, np.ndarray)
+    assert Y.dtype == X.dtype
+
+    dev = dpt.Device.create_device()
+    Z = dpt.from_dlpack(C, device=dev)
+    assert isinstance(Z, dpt.usm_ndarray)
+    assert Z.device == dev
+
+
 def test_generic_container():
     get_queue_or_skip()
     C = Container(dpt.linspace(0, 100, num=20, dtype="int16"))