How to test protected void java function with JUnit?

Question

Java

Dear friends, we need help. There is a simple GUI toy, it remains only to test some functions. One such processWindowEvent. Actually code:

protected void processWindowEvent(WindowEvent e) {
        super.processWindowEvent(e);
        if(e.getID() == WindowEvent.WINDOW_CLOSING){
            System.exit(0);
        }
    }

JUnit generated the following code:

@Test
    public void testProcessWindowEvent() {
        System.out.println("processWindowEvent");
        WindowEvent e = null;
        Frame instance = new Frame();
        instance.processWindowEvent(e);
        // TODO review the generated test code and remove the default call to fail.
    }

I can not understand the very essence of testing this function. Thank you in advance.

Answer 1

Not sure what exactly you are asking?

• Why test? It's up to you. Such a simple method may not be tested.
  
• How is a protected method tested? Solved by putting the testing class in the same package.
  stackoverflow.com/questions/440786/junit-java-test...
  

Answer 2

In general, protected methods do not need to be tested, they are tested in the same way as private methods within the framework of testing public methods that call these methods.