How to click on an item inside a RecyclerView in Espresso

Use RecyclerViewActions

onView(withId(R.id.recyclerView))
    .perform(actionOnItemAtPosition(0, click()));

Include this in your gradle script:

dependencies {
    androidTestCompile 'com.android.support.test.espresso:espresso-core:2.0'
    androidTestCompile 'com.android.support.test.espresso:espresso-contrib:2.0'
}