Testing List View with Espresso Data Adapter

Espresso Data Adapter is used for testing of  Adapter Views like ListView & GirdView. In short Adapter Views is view whose children are bounded by an Adapter. In this case we need to use onData() instead if onView() because onData() is the one who matches the Data bound to the view item.


Video Tutorial -

I am going to explain testing of ListView using Espresso in detail. Below is the screenshot of the App with 50 List items. Each row contains a TextView and a ToggleButton. At the top of there is Text "Clicked on row no." which will show the row number on which you just clicked. The ToggleButton if checked displays text "checked". This is all about the ListView which we are going to test now.

Espresso Data Adapter

1.Testing Scrolling functionality of ListView - In this we need to test scrolling to particular position and scrolling to the end of ListView

@Testpublic void testScrollingAt()throws Exception
{
    // Scrolls till the position 20 

 onData(hasEntry(equalTo(ListViewSample.ROW_TEXT),is("List item: 20")))

    .check(matches(isCompletelyDisplayed()));
    //scrolls till the end     

onData(hasEntry(equalTo(ListViewSample.ROW_TEXT),is("List item: 49")))

    .check(matches(isCompletelyDisplayed()));
}

 
Testing List Items with Espresso

2. Testing clicking on particular List item and checking the List item is selected.

@Testpublic void testClickOnListItem()
{
    onData(hasEntry(equalTo(ListViewSample.ROW_TEXT),is("List item: 25")))
            .onChildView(withId(R.id.rowTextView)).perform(click());
    onView(withId(R.id.selection_row_value)).check(matches(withText("25")));
}

 
Testing List with Espresso Adapter

4. Testing Toggle button for particular row

@Testpublic void testToggleButton()throws Exception
{
    onData(hasEntry(equalTo(ListViewSample.ROW_TEXT),is("List item: 25")))
            .onChildView(withId(R.id.rowToggleButton)).perform(click());
    Thread.sleep(1000);
    onData(hasEntry(equalTo(ListViewSample.ROW_TEXT),is("List item: 25")))
            .onChildView(withId(R.id.rowToggleButton)).check(matches(isChecked()));
}

Testing List with Espresso Adapter

I hope this post helps you find your code coverage for your test suit :)
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Download sample code from - https://github.com/googlesamples/android-testing