### Question:
AbstractInstanceManager { public List<V> getMultiples(final K parent) { return new ArrayList<>(Option.of(this.prototypes.get(parent)) .map(Map::values) .getOrElse(Collections.emptyList())); }  V registerSingle(final K parent, final V instance); V registerMultiple(
        final K parent,
        final Selector selector,
        final V instance
    ); Option<V> getMultiple(final K parent, final Selector selector); List<V> getAll(final K parent); List<V> getMultiples(final K parent); Option<V> getSingle(final K parent);  }### Answer:
@Test public void getMultiples() { this.instanceManager.registerMultiple(PARENT, SEL_1, ACTUAL_1); this.instanceManager.registerMultiple(PARENT, SEL_2, ACTUAL_2); assertThat(this.instanceManager.getMultiples(PARENT)).containsExactlyInAnyOrder(ACTUAL_1, ACTUAL_2); }