CODEWITHSUNDEEP
androidandroid-recyclerviewandroid-espressoui-testing
Peter Z.
Peter Z.

Reputation: 188

Espresso, how to scroll to bottom and IDLE state of recycler view

I am learning UI testing with Espresso. I want to test scrolling of recycler view to bottom and only then load next page from view model and pass it recycler view.

I have following onScrollListener in my fragment:

private fun setupOnScrollListener() {
        recyclerViewApi.addOnScrollListener(object : RecyclerView.OnScrollListener() {
            override fun onScrollStateChanged(recyclerView: RecyclerView, newState: Int) {
                super.onScrollStateChanged(recyclerView, newState)

                val isRecyclerViewBottom = !recyclerView.canScrollVertically(1) &&
                        newState == RecyclerView.SCROLL_STATE_IDLE

                if (isRecyclerViewBottom) {
                    downloadNextPage()
                }
            }
        })
    }

private fun downloadNextPage() {
        showProgressBar(true)
        viewModel.getNextMovies()
    }

When I test it manually with Log.d() it works great.

My question is: How to use Espresso (or maybe different API, if you know better than Espresso) to scroll recycler view to this state: isRecyclerViewBottom = !recyclerView.canScrollVertically(1) && newState == RecyclerView.SCROLL_STATE_IDLE, so my downloadNextPage() will be invoked and test function will pull more data.

My test function:

@Test
    fun scrollToBottom_isNextPageLoaded(){
        every { repository.getApiMovies(any(), any()) } returns
                Flowable.just(Resource.success(moviesList1_5)) andThen
                Flowable.just(Resource.success(moviesList1_10))

        val scenario = launchFragmentInContainer<ApiFragment>(factory = fragmentsFactory)
        //first 5 items are in view, so I go to the last item (index 4)
        recyclerView.perform(scrollToPosition<ViewHolder>(4))
        recyclerView.perform(swipeDown())
       //Below doesn't make any difference
        Thread.sleep(1000L) 

        verify(exactly = 2) { repo.getApiMovies(any(), any()) }
    }

I use Robolectric, Mockk, Espresso. I have mocked here repository class, which is passed to constructor of ViewModelFactory, which is passed to constructor of the ApiFragment.

Message from JUnit:

java.lang.AssertionError: Verification failed: call 1 of 1: ApiRepository(repo#4).getApiMovies(any(), any())). 
One matching call found, but needs at least 2 and at most 2 calls
Call: ApiRepository(repo#4).getApiMovies(Top Rated, 1)

It is not my first test function. Everything else works great. I just don't know how to make Espresso to go to bottom of recycler view and 'pull up' bottom edge of it to call downloadNextPage()

Upvotes: 1

Views: 1743

Answers (1)

Peter Z.
Peter Z.

Reputation: 188

Ok. I have just found a sollution. I changed recyclerView.perform(swipeDown()) to recyclerView.perform(swipeUp()).

Upvotes: 2

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