Using onData with Espresso

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I am trying to access a child view of a view. This is the line I am currently trying to get to work. 

onData(withDesc("Description")).onChildView(withId(R.id.positive)).perform(click());

private static Matcher<Object> withDesc(String desc) {
    return onView(withContentDescription(desc));
}

But this is returning a ViewInteraction and not a Object. How do I switch this so it will work?

android-espresso android-testing android
2 Answers

This is the example usage by Google's android-testing repo

 private static DataInteraction onRow(String str) {
     return onData(hasEntry(equalTo(LongListActivity.ROW_TEXT), is(str)));
 }
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