@Test public void mapT1() { Tuple8<String, Integer, Integer, Integer, Integer, Integer, Integer, Integer> base = Tuples.of("Foo", 200, 300, 400, 500, 600, 700, 800); Tuple2<?,?> mapped = base.mapT1(String::length); assertThat(mapped).isNotSameAs(base) .hasSize(8) .containsExactly(3, base.getT2(), base.getT3(), base.getT4(), base.getT5(), base.getT6(), base.getT7(), base.getT8()); }