Espresso - 如何点击随机的RecyclerView项目？

Question

有一些帖子显示如何点击带有Espresso的RecyclerView中的某个已修复项目，例如：

How to click on an item inside a RecyclerView in Espresso

Using Espresso to click view inside RecyclerView item

示例：

//Change the 0 with any other number, will be the position of the item clicked.
onView(withId(R.id.a_main_recycler))
                .perform(RecyclerViewActions
                        .actionOnItemAtPosition(0, click()));

但是，如果您想点击RecyclerView中的随机项，该怎么办？

Answer 1

使用ActivityTestRule的getActivity()方法。

您将能够使用findViewById()（与任何其他上下文一样）和处理 RecyclerView实例。

示例：

@RunWith(AndroidJUnit4.class)
public class RandomBehaviorTest {

    //This rule provides functional testing of a single activity.
    @Rule
    public ActivityTestRule<MainActivity> mActivityRule =
            new ActivityTestRule<>(MainActivity.class);

    @Test
    public void clickRandomItem() {
        //Magic happening
        int x = getRandomRecyclerPosition(R.id.a_main_recycler);

        onView(withId(R.id.a_main_recycler))
                .perform(RecyclerViewActions
                        .actionOnItemAtPosition(x, click()));
    }

    private int getRandomRecyclerPosition(int recyclerId) {
        Random ran = new Random();
        //Get the actual drawn RecyclerView 
        RecyclerView recyclerView = (RecyclerView) mActivityRule
                .getActivity().findViewById(recyclerId);

        //If the RecyclerView exists, get the item count from the adapter
        int n = (recyclerView == null)
                ? 1
                : recyclerView.getAdapter().getItemCount();

        //Return a random number from 0 (inclusive) to adapter.itemCount() (exclusive) 
        return ran.nextInt(n);
    }

}