AccordionList implements Iterable<RangedValue<T>> { public boolean isEmpty() { return mRangeList.isEmpty(); }  @NonNull @Override Iterator<RangedValue<T>> iterator(); @Override int hashCode(); @Override boolean equals(Object object); @NonNull T valueAt(int location); @NonNull RangedValue<T> rangedValueAt(int location); @NonNull RangedValue<T> get(int entryIndex); @NonNull Range span(); int size(); boolean isEmpty(); void add(@NonNull T value, int size); void add(int entryIndex, @NonNull T value, int size); void addAll(@NonNull AccordionList<T> values); void set(int entryIndex, @NonNull T value, int size); void clear(); void remove(int entryIndex);  }
@Test public void test_IsEmptyTrue() { AccordionList<String> list = new AccordionList<>(); assertTrue(list.isEmpty()); }