Groovy5101Test.groovy

class Groovy5101Test extends GroovyTestCase {

    static class ClassA {
        Runnable r
        ClassA(Runnable r) { this.r = r }
        String getSomething() { "hello" }
    }

    static class Factory {
        ClassA getClassA1(Runnable r) {
            new ClassA(r)
        }
        ClassA getClassA2(Runnable r) {
            new ClassA(r) {
                String getSomething() { "a fixed message" }
            }
        }
        ClassA getClassA3(Runnable r) {
            new ClassA(r) {
                String getSomething() { r.toString() }
            }
        }
    }

    Runnable r
    Factory factory

    void setUp() {
        this.r = new Runnable() {
            void run() { "A!" }
        }
        this.factory = new Factory()
    }

    void test_NotInnerAnonymousClass() {
        assert factory.getClassA1(r).getSomething() == "hello"
    }

    void test_InnerAnonymousClass_NotUsingArgument() {
        assert factory.getClassA2(r).getSomething() == "a fixed message"
    }

    void test_InnerAnonymousClass_UsingArgument() {
        // it should be OK but the result is NG
        assert factory.getClassA3(r).getSomething() == r.toString()
    }

}