Add test for SyclQueue boxing without parent

Author: ZzEeKkAa

numba_dpex/tests/core/types/DpctlSyclQueue/test_box.py

@@ -0,0 +1,27 @@
+# SPDX-FileCopyrightText: 2020 - 2023 Intel Corporation
+#
+# SPDX-License-Identifier: Apache-2.0
+
+"""
+Tests for boxing for dpnp.ndarray
+"""
+
+import dpnp
+import pytest
+from dpctl import SyclQueue
+
+from numba_dpex import dpjit
+
+
+def test_boxing_without_parent():
+    """Test unboxing of the queue that does not have parent"""
+
+    @dpjit
+    def func() -> SyclQueue:
+        arr = dpnp.empty(10)
+        queue = arr.sycl_queue
+        return queue
+
+    q: SyclQueue = func()
+
+    assert len(q.sycl_device.filter_string) > 0