Renamed get_sycl_backend method in SyclQueue to backend property

Removed name-sake property added to query the underlying sycl_device

dpctl/_sycl_queue.pyx

@@ -644,8 +644,12 @@ cdef class SyclQueue(_SyclQueue):
         else:
             return False
 
-    def get_sycl_backend(self):
-        """ Returns the Sycl backend associated with the queue.
+    @property
+    def backend(self):
+        """ Returns the backend_type enum value for this queue.
+
+        Returns:
+            backend_type: The backend for the queue.
         """
         cdef _backend_type BE = DPCTLQueue_GetBackend(self._queue_ref)
         if BE == _backend_type._OPENCL:
@@ -959,16 +963,6 @@ cdef class SyclQueue(_SyclQueue):
 
         return SyclEvent._create(ERef, [])
 
-    @property
-    def backend(self):
-        """Returns the backend_type enum value for the device
-        associated with this queue.
-
-        Returns:
-            backend_type: The backend for the device.
-        """
-        return self.sycl_device.backend
-
     @property
     def name(self):
         """Returns the device name for the device

dpctl/tests/test_sycl_queue.py

@@ -424,6 +424,8 @@ def test_queue_submit_barrier(valid_filter):
     ev3.wait()
     ev1.wait()
     ev2.wait()
+    with pytest.raises(TypeError):
+        q.submit_barrier(range(3))
 
 
 def test_queue__repr__():
@@ -488,6 +490,11 @@ def test_constructor_many_arg():
         dpctl.SyclQueue(None, None, None, None)
     with pytest.raises(TypeError):
         dpctl.SyclQueue(None, None)
+    ctx = dpctl.SyclContext()
+    with pytest.raises(TypeError):
+        dpctl.SyclQueue(ctx, None)
+    with pytest.raises(TypeError):
+        dpctl.SyclQueue(ctx)
 
 
 def test_queue_wait():
@@ -510,3 +517,11 @@ def test_queue_memops():
     q.memcpy(m1, m2, 512)
     q.prefetch(m1, 512)
     q.mem_advise(m1, 512, 0)
+    with pytest.raises(TypeError):
+        q.memcpy(m1, list(), 512)
+    with pytest.raises(TypeError):
+        q.memcpy(list(), m2, 512)
+    with pytest.raises(TypeError):
+        q.prefetch(list(), 512)
+    with pytest.raises(TypeError):
+        q.mem_advise(list(), 512, 0)