image_test.go: Improve the test content

Signed-off-by: zhouhao <[email protected]>

Author: zhouhao

image/image_test.go

@@ -66,7 +66,11 @@ const (
             "/var/job-result-data": {},
             "/var/log/my-app-logs": {}
         },
-        "WorkingDir": "/home/alice"
+        "WorkingDir": "/home/alice",
+        "Labels": {
+            "com.example.project.git.url": "https://example.com/project.git",
+            "com.example.project.git.commit": "45a939b2999782a3f005621a8d0f29aa387e1d6b"
+        }
     },
     "rootfs": {
       "diff_ids": [