Add v2.3 support for get_resource method

Change-Id: I8745f401b3b3d17522d40a63f9dd51a9a720af82

rsd_lib/tests/unit/resources/v2_3/test_rsdlib_v2_3.py

@@ -17,6 +17,7 @@ import json
 import mock
 import testtools
 
+from rsd_lib.exceptions import NoMatchingResourceError
 from rsd_lib.resources.v2_1.chassis import chassis as v2_1_chassis
 from rsd_lib.resources.v2_1.event_service import event_service \
     as v2_1_event_service
@@ -219,3 +220,32 @@ class RSDLibV2_3TestCase(testtools.TestCase):
     #     mock_telemetry_service.assert_called_once_with(
     #         self.rsd._conn, '/redfish/v1/TelemetryService',
     #         redfish_version=self.rsd.redfish_version)
+
+    def test_get_resource(self):
+        with mock.patch.object(
+            self.rsd,
+            "_get_resource_class_from_path",
+            return_value=v2_3_storage_service.storage_pool.StoragePool,
+        ):
+            with open(
+                "rsd_lib/tests/unit/json_samples/v2_3/storage_pool.json",
+                "r"
+            ) as f:
+                self.conn.get.return_value.json.return_value = json.loads(
+                    f.read()
+                )
+            self.assertIsInstance(
+                self.rsd.get_resource(
+                    "/redfish/v1/TelemetryService"),
+                v2_3_storage_service.storage_pool.StoragePool
+            )
+
+    def test_get_resource_with_no_class_match(self):
+        with mock.patch.object(
+            self.rsd, "_get_resource_class_from_path", return_value=None
+        ):
+            self.assertRaises(
+                NoMatchingResourceError,
+                self.rsd.get_resource,
+                "/redfish/v1/chassis/1",
+            )