[to #42322933]add test case to check xtcocotools availbility

Link: https://code.alibaba-inc.com/Ali-MaaS/MaaS-lib/codereview/10462622

    * add test case to check xtcocotools availbility

tests/utils/test_compatibility.py

@@ -0,0 +1,19 @@
+# Copyright (c) Alibaba, Inc. and its affiliates.
+
+import unittest
+
+
+class CompatibilityTest(unittest.TestCase):
+
+    def setUp(self):
+        print(('Testing %s.%s' % (type(self).__name__, self._testMethodName)))
+
+    def tearDown(self):
+        super().tearDown()
+
+    def test_xtcocotools(self):
+        from xtcocotools.coco import COCO
+
+
+if __name__ == '__main__':
+    unittest.main()