Mock/Test Super class call in subclass..is it possible?

Question

I am looking for a solution to mock the super call in subclass ButtonClicker.

Class Click {
      public void buttonClick() throws java.lang.Exception { /* compiled code */ }     } 

Class ButtonClicker extends Click { 
    @Override
    public void buttonClick() throws Exception {

        super.buttonClick();
    } }

Answer 1

Using inheritance reduces testability of your code. Consider replacing inheritance with the delegation and mock the delegate.

Extract the interface IClicker

interface IClicker {
    void buttonClick();
}

Implement IClicker in Clicker class. In case that you are working with third-party code consider using Adapter Pattern

Rewrite your ButtonClicker as following:

class ButtonClicker implements IClicker {
    Clicker delegate;

    ButtonClicker(Clicker delegate) {
        this.delegate = delegate;
    }

    @Override
    public void buttonClick() throws Exception {
        delegate.buttonClick();
    }

}

Now just pass the mock as a constructor parameter:

Clicker mock = Mockito.mock(Clicker.class);
// stubbing here
ButtonClicker buttonClicker = new ButtonClicker(mock);