}

  @Override
  protected Map<String, Collection<Integer>> makeEmptyMap() {
    Multimap<String, Integer> multimap = createMultimap();
    return multimap.asMap();
  }

  @Override
  protected Map<String, Collection<Integer>> makePopulatedMap() {
    Multimap<String, Integer> multimap = createMultimap();
    populate(multimap);
    return multimap.asMap();
  }

  }

  private Multimap<String, Integer> createMultimap() {
    return ImmutableListMultimap.<String, Integer>builder()
        .put("foo", 1)
        .put("bar", 2)
        .put("foo", 3)
        .build();
  }

  public void testMultimapReads() {
    Multimap<String, Integer> multimap = createMultimap();
    assertTrue(multimap.containsKey("foo"));