New actions and assertions

Check that EditText has hint #36

assertHint(R.id.edittext, R.string.hint);
assertHint(R.id.edittext, "Hint");

Tap a button of a Recycler's row #32

clickRecyclerViewItemChild(R.id.recycler, 3, R.id.button);
clickRecyclerViewItemChild(R.id.recycler, 3, "Button");

Tap a RadioButton using its position #30

clickRadioButtonPosition(R.id.radiogroup, 42);