Redux-persist: Suppress the console.error message when running unit tests

[AdrienLemaire]

Related issues: #638 and #848.

When running my jest tests with redux-persist v5 (5.10.0 to be precise), I get the following console.error message:

 PASS  src/__tests__/reducers-test.js                                 
  ● Console                                                         

    console.error node_modules/redux-persist/lib/storage/getStorage.js:40
      redux-persist failed to create sync storage. falling back to memory storage.

What is the proper method to remove this message from my output ?
Note that my code imports storage as follow in my root reducer file:

import localStorage from "redux-persist/lib/storage";

[pgrzesik]

+1, is anyone by chance working on that ? I'm using Jest for tests

[seeker105]

+1 I'm having the same error.

[achan]

This is not the proper solution, but a workaround would be to mock localStorage.

[seeker105]

Thanks! The solution at the link didn't work for me, but this one from StackOverflow did:

in src/setupTests.js file add

class LocalStorageMock {
  constructor() {
    this.store = {};
  }

  clear() {
    this.store = {};
  }

  getItem(key) {
    return this.store[key] || null;
  }

  setItem(key, value) {
    this.store[key] = value.toString();
  }

  removeItem(key) {
    delete this.store[key];
  }
};

global.localStorage = new LocalStorageMock;

I'm using the create-react-app utility which has a script that causes my src/setupTests.js file to run automatically when testing starts. If you have a different setup you might need to put this code somewhere else. Just make sure it runs before your tests start.

[kirushi]

Thanks @seeker105 - stubbing it worked!

[azolson]

for those of you who have implemented something apart from localStorage, don't forget to change your class accordingly. I wasted 10 minutes on trying to figure why the mock wasn't working!

Example below is for those using sessionStorage(based on @seeker105 's comment above):

class SessionStorageMock {
    constructor() {
      this.store = {};
    }

    clear() {
      this.store = {};
    }

    getItem(key) {
      return this.store[key] || null;
    }

    setItem(key, value) {
      this.store[key] = value.toString();
    }

    removeItem(key) {
      delete this.store[key];
    }
  };

  global.sessionStorage = new SessionStorageMock;

[bruno-gama]

I wanna +1 and bump this, I know the getStorage function already checks if NODE_ENV !== production, so it could also check if the env is test too.

It's easy to open a PR for this change, I just don't know if it is something you're interested in.

[obiwankenoobi]

@seeker105 works great!