@Test
public void testChain() throws Exception {
io.freefair.util.function.Function<Integer, Integer> a =
new io.freefair.util.function.Function<Integer, Integer>() {
@Nullable
@Override
public Integer apply(@Nullable Integer value) {
return value * 3;
}
};
io.freefair.util.function.Function<Integer, Integer> b =
new io.freefair.util.function.Function<Integer, Integer>() {
@Nullable
@Override
public Integer apply(@Nullable Integer value) {
return value + 3;
}
};
io.freefair.util.function.Function<Integer, Integer> chain1 =
io.freefair.util.function.Functions.chain(a, b);
io.freefair.util.function.Function<Integer, Integer> chain2 = Functions.chain(b, a);
for (int i = -3; i < 3; i++) {
assertEquals((i * 3) + 3, (int) chain1.apply(i));
assertEquals((i + 3) * 3, (int) chain2.apply(i));
}
}
@Test
public void testIdentity() throws Exception {
Collection<Object> objects = new ArrayList<>();
objects.add("Hallo");
objects.add(55);
objects.add(new ArithmeticException());
io.freefair.util.function.Function<Object, Object> identity =
io.freefair.util.function.Functions.identity();
for (Object obj : objects) {
assertSame(obj, identity.apply(obj));
}
}