title: How to mock @ngrx/store state in Angular 8 unit tests with MockStore and MemoizedSelector
body: <p>I am trying to create unit testing with jest in angular 8 with RXJS. I want to mock store. I am using <a href="https://ngrx.io/guide/store/testing" rel="nofollow noreferrer">https://ngrx.io/guide/store/testing</a> example of Using Mock Selectors. could anyone help me to how can I use  MemoizedSelector and  MockStore to use mock the store independently.</p>
  
  <pre><code> this.store.select(homeState).pipe(select(s =&gt; s.checkStatus)).subscribe(status =&gt; {
       console.log(status);
       // We performation other action.
  });
  </code></pre>
  
  <p>I have many selectors in this component. how can I mock many selectors and update the selector's value for each test case? </p>