Added a test to check MemoryConstructor(other_memory_object)

Author: oleksandr-pavlyk

dpctl/tests/test_sycl_usm.py

@@ -454,3 +454,24 @@ def test_cpython_api(memory_ctor):
     capi_nbytes = get_nby_fn(mobj)
     direct_nbytes = mobj.nbytes
     assert capi_nbytes == direct_nbytes
+
+
+def test_memory_construction_from_other_memory_objects():
+    try:
+        q = dpctl.SyclQueue()
+    except dpctl.SyclQueueCreationError:
+        pytest.skip("Default queue could not be created")
+    m_sh = MemoryUSMShared(256, queue=q)
+    m_de = MemoryUSMDevice(256, queue=q)
+    m_ho = MemoryUSMHost(256, queue=q)
+    with pytest.raises(ValueError):
+        MemoryUSMDevice(m_sh)
+    with pytest.raises(ValueError):
+        MemoryUSMHost(m_de)
+    with pytest.raises(ValueError):
+        MemoryUSMShared(m_ho)
+    m1 = MemoryUSMDevice(m_sh, copy=True)
+    m2 = MemoryUSMHost(m_de, copy=True)
+    m3 = MemoryUSMShared(m_de, copy=True)
+    assert bytes(m1) == bytes(m_sh)
+    assert bytes(m2) == bytes(m3)