What is the purpose of Redux Async Action Testing?

Could someone explain why we test asynchronous actions? What are we hoping to ensure works?

So in the docs, http://ift.tt/1WuLEat, we mock the server request.

nock('http://example.com/')
  .get('/todos')
  .reply(200, { todos: ['do something'] })

const expectedActions = [
  { type: types.FETCH_TODOS_REQUEST },
  { type: types.FETCH_TODOS_SUCCESS, body: { todos: ['do something']  } }
]
const store = mockStore({ todos: [] }, expectedActions, done)
store.dispatch(actions.fetchTodos())

So we aren't testing to see if we contact the server. We are testing to see if the correct sequence of actions takes place, given a response of 200 correct?