### Question:
ListArgumentSet implements ArgumentSet { @Override public List<String> getAll() { return Collections.unmodifiableList(arguments); } ListArgumentSet(List<String> arguments); @Override String get(int index); @Override int length(); @Override List<String> getAll(); @Override boolean isEmpty(); @Override boolean has(String argument); @Override String join(); @Override String[] toArray();  }### Answer:
@Test public void getAll() { assertEquals(BACKING_LIST, listArgumentSet.getAll()); }