Tuple1MapperImpl extends AbstractTupleMapper<T, Tuple1<T0>> implements TupleMapper<T, Tuple1<T0>> { @Override public Tuple1<T0> apply(T t) { return Tuples.of( get0().apply(t) ); } Tuple1MapperImpl(Function<T, T0> m0); @Override Tuple1<T0> apply(T t); Function<T, T0> get0();  }
@Test void apply() { assertEquals(Tuples.of(0), instance.apply(0)); }