Add functional test for cached image command

Implements tests for cache clear operations including queue,
cache, and combined clearing functionality.

Change-Id: I71056bb5db6c3de4f9294ac1b661ab927f59c867
Signed-off-by: wonjun0120 <wonjundero@gmail.com>

openstackclient/tests/functional/image/v2/test_cache.py

@@ -0,0 +1,54 @@
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+import uuid
+
+from openstackclient.tests.functional.image import base
+
+
+class CacheTests(base.BaseImageTests):
+    """Functional tests for Cache commands"""
+
+    def test_cached_image(self):
+        """Test cached image operations including queue and clear"""
+        # Create test image
+        name = uuid.uuid4().hex
+        output = self.openstack(
+            f'image create {name}',
+            parse_output=True,
+        )
+        image_id = output["id"]
+        self.assertOutput(name, output['name'])
+
+        # Register cleanup for created image
+        self.addCleanup(
+            self.openstack, 'cached image delete ' + image_id, fail_ok=True
+        )
+        self.addCleanup(self.openstack, 'image delete ' + image_id)
+
+        # Queue image for caching
+        self.openstack('cached image queue ' + image_id)
+
+        # Verify queuing worked
+        cache_output = self.openstack('cached image list', parse_output=True)
+        self.assertIsInstance(cache_output, list)
+        image_ids = [img['ID'] for img in cache_output]
+        self.assertIn(image_id, image_ids)
+
+        # Clear cached images
+        self.openstack('cached image clear')
+
+        # Verify clearing worked
+        output = self.openstack('cached image list', parse_output=True)
+        if output:
+            image_ids = [img['ID'] for img in output]
+            self.assertNotIn(image_id, image_ids)