public virtual void zip_longerSecond()
        {
            Stream <int>              numbers  = Stream.of(0, 1, 2);
            Stream <string>           letters  = Stream.of("a", "b", "c", "d");
            IDictionary <int, string> expected = ImmutableMap.of(0, "a", 1, "b", 2, "c");
            IDictionary <int, string> result   = MapStream.zip(numbers, letters).toMap();

            assertThat(result).isEqualTo(expected);
        }