Cory Roy Cory Roy - 5 months ago 31
Android Question

Assert proper number of items in list with espresso

What is the best way to inspect and assert that a listview is the expected size with android espresso?

I wrote this matcher, but don't quite know how to integrate it into the test.

public static Matcher<View> withListSize (final int size) {
return new TypeSafeMatcher<View> () {
@Override public boolean matchesSafely (final View view) {
return ((ListView) view).getChildCount () == size;
}

@Override public void describeTo (final Description description) {
description.appendText ("ListView should have " + size + " items");
}
};
}

Answer

Figured this out.

class Matchers {
  public static Matcher<View> withListSize (final int size) {
    return new TypeSafeMatcher<View> () {
      @Override public boolean matchesSafely (final View view) {
        return ((ListView) view).getChildCount () == size;
      }

      @Override public void describeTo (final Description description) {
        description.appendText ("ListView should have " + size + " items");
      }
    };
  }
}

If expecting one item in the list, put this in the actual test script.

onView (withId (android.R.id.list)).check (ViewAssertions.matches (Matchers.withListSize (1)));
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