media-state-changed 消息，如果状态没变化的话，不更新状态

client/jest.config.js

@@ -80,7 +80,9 @@ export default {
   ],
 
   // A map from regular expressions to module names or to arrays of module names that allow to stub out resources with a single module
-  // moduleNameMapper: {},
+  moduleNameMapper: {
+    "^/module/(.*)$": "<rootDir>/src/$1"
+  },
 
   // An array of regexp pattern strings, matched against all module paths before considered 'visible' to the module loader
   // modulePathIgnorePatterns: [],