Update projects/ngrx.io/content/examples/testing-store/src/app/state/books.reducer.spec.ts

Co-authored-by: Tim Deschryver <28659384+timdeschryver@users.noreply.github.com>

Author: rybskiMariusz

projects/ngrx.io/content/examples/testing-store/src/app/state/books.reducer.spec.ts

@@ -31,7 +31,7 @@ describe('BooksReducer', () => {
       const state = fromReducer.booksReducer(initialState, action);
 
       expect(state).toEqual(newState);
-      expect(state).not.toEqual(initialState);
+      expect(state).not.toBe(initialState);
     });
   });
 });