Asserting agains the store

logout.spec.js

beforeEach(function () {
    spyRouter = { push: jest.fn() };
    initialState = {profile: {id: '123456789H'}};
    store = configureStore(initialState);
});

it("clears store's state on logout", (done) => {
    expect(store.getState().profile.id).toEqual(initialState.profile.id);
    store.subscribe(() => {
        expect(store.getState().profile.id).toEqual('');
        done();
    });
    mountLogoutPage();
});

function mountLogoutPage() {
    let LogoutPage = createLogoutPage();
    mount(
        <Provider store={store}>
            <LogoutPage router={spyRouter} />
        </Provider>);
}