fs: add test for filling auth

Signed-off-by: Bin Tang <[email protected]>

rafs/src/fs.rs

@@ -1082,6 +1082,57 @@ pub(crate) mod tests {
         Box::new(rafs)
     }
 
+    #[test]
+    fn test_fill_auth() {
+        let config = r#"
+        {
+            "device": {
+              "id": "test",
+              "backend": {
+                "type": "registry",
+                "config": {
+                    "readahead": false,
+                    "host": "docker.io",
+                    "repo": "library/nginx",
+                    "scheme": "https",
+                    "proxy": {
+                        "fallback": false
+                    },
+                    "timeout": 5,
+                    "connect_timeout": 5,
+                    "retry_limit": 8
+                }
+              }
+            },
+            "mode": "direct",
+            "digest_validate": false,
+            "enable_xattr": true,
+            "fs_prefetch": {
+              "enable": true,
+              "threads_count": 10,
+              "merging_size": 131072,
+              "bandwidth_rate": 10485760
+            }
+          }"#;
+        let rafs_config = RafsConfig::from_str(config).unwrap();
+        let test_auth = "test_auth".to_string();
+        let rafs_config = rafs_config.fill_auth(&Some(test_auth.clone()));
+        if let Err(_) = serde_json::from_value(rafs_config.device.backend.backend_config.clone())
+            .map(|config: RegistryConfig| {
+                if config.auth.is_none() {
+                    panic!()
+                }
+                if let Some(auth) = config.auth {
+                    if auth != test_auth {
+                        panic!()
+                    }
+                }
+            })
+        {
+            panic!("failed to serde json")
+        };
+    }
+
     #[test]
     fn it_should_create_new_rafs_fs() {
         let rafs = new_rafs_backend();