Inner class test proxy for private methods

AClass.java

public class AClass {
   private Object aPrivateMethod() {return null;}

   final class AClassTestProxy {
       Object aPrivateMethod() {
           return AClass.this.aPrivateMethod();
       }
   }
}

class AClassTest {
    public void testAPrivateMethod() {
        AClass.AClassTestProxy aClassTestProxy = new AClass().new AClassTestProxy();
        assertNull(aClassTestProxy.aPrivateMethod());
    }
}