Multisets.immutableEntry("b", 1),
            Multisets.immutableEntry("a", 1),
            Multisets.immutableEntry("c", 3));
  }

  public void testToImmutableMultiset_duplicates() {
    class TypeWithDuplicates {
      final int a;
      final int b;

      TypeWithDuplicates(int a, int b) {
        this.a = a;
        this.b = b;
      }

      @Override