### Question:
Tuple4OfNullablesMapperImpl extends AbstractTupleMapper<T, Tuple4OfNullables<T0, T1, T2, T3>> implements TupleMapper<T, Tuple4OfNullables<T0, T1, T2, T3>> { public Function<T, T1> get1() { return getAndCast(1); } Tuple4OfNullablesMapperImpl(
            Function<T, T0> m0,
            Function<T, T1> m1,
            Function<T, T2> m2,
            Function<T, T3> m3); @Override Tuple4OfNullables<T0, T1, T2, T3> apply(T t); Function<T, T0> get0(); Function<T, T1> get1(); Function<T, T2> get2(); Function<T, T3> get3();  }### Answer:
@Test void get1() { assertEquals(m1, instance.get1()); }