public void testBasicFunction() throws Exception {
Function f = x -> x;
assertEquals(42, f.apply(42));
Function<Integer, Integer> f2 = x -> x;
assertEquals((Integer) 42, f2.apply(42));
Function f3 =
x -> {
int y = 42;
return y;
};
assertEquals(42, f3.apply(null));
FourToOne<String, Double, Integer, Boolean, String> appendFour = (a, b, c, d) -> a + b + c + d;
assertEquals("Foo4.214true", appendFour.apply("Foo", 4.2, 14, true));
}
// Tests outer reference resolution, and that inner fields are being correctly resolved for
// lambdas with implicit blocks.
public void testAdditionInLambda() throws Exception {
Function f =
new Function<Integer, Integer>() {
@Override
public Integer apply(Integer x) {
return x + 20;
}
};
assertEquals(42, f.apply(22));
Function<Integer, Integer> g =
x -> {
return x + 20;
};
assertEquals((Integer) 42, g.apply(22));
Function<Integer, Integer> h = x -> x + 20;
assertEquals((Integer) 42, h.apply(22));
}
public void testBasicAnonymousClass() throws Exception {
Function h =
new Function() {
@Override
public Object apply(Object x) {
return x;
}
};
assertEquals(42, h.apply(42));
}
public void testStaticFunctions() throws Exception {
assertEquals(42, staticF.apply(42));
}