Adjusted test for reconstruction of USM host allocation from SUAI (#846)

The dpctl.MemoryUSM* Python object representing USM allocation are
reconstructed from an object exposing __sycl_usm_array_interface__
use USM-pointer queries. When SUAI provides sycl::context object,
the device is inferred using `get_pointer_device`. For host
allocations this may not need to return the device in the queue used
to make the allocation. It will return the first device in the context
to which the allocation is bound instead (per SYCL 2020 spec).

Author: oleksandr-pavlyk

dpctl/tests/test_sycl_usm.py

@@ -473,13 +473,24 @@ def check_view(v):
     """
     assert type(v) is View
     buf = v.buffer_
+    buf_usm_type = buf.get_usm_type()
     m = as_usm_memory(v)
-    assert m.get_usm_type() == buf.get_usm_type()
+    assert m.get_usm_type() == buf_usm_type
     assert m._pointer == buf._pointer
-    assert m.sycl_device == buf.sycl_device
+    if buf_usm_type == "host":
+        buf_ctx = buf.sycl_context
+        assert m.sycl_context == buf_ctx
+        assert m.sycl_device == buf_ctx.get_devices()[0]
+    else:
+        assert m.sycl_context == buf.sycl_context
+        assert m.sycl_device == buf.sycl_device
 
 
 def test_with_constructor(memory_ctor):
+    """
+    Tests that memory objects reconstructed from __sycl_usm_array_interface__
+    are consistent with the original memory buffer.
+    """
     try:
         buf = memory_ctor(64)
     except Exception: