How to mock void methods with Mockito

To mock a void method with Mockito, you can use the doAnswer method. Here is an example of how you can use it:

// Create a mock of the class that has the void method you want to mock
MyClass mock = mock(MyClass.class);

// Use the doAnswer method to specify what should happen when the void method is called
doAnswer(new Answer() {
  public Void answer(InvocationOnMock invocation) {
    // Here you can specify the behavior of the void method
    Object[] args = invocation.getArguments();
    // You can also access the mock object itself using the 'invocation.getMock()' method
    return null;
  }
}).when(mock).voidMethod(anyInt(), anyString());

This will cause the voidMethod to do nothing when it is called, but you can customize the behavior by modifying the answer method.

Note that doAnswer returns a Stubber, so you need to use the when method to specify which method you want to stub. You can also use doNothing if you just want the method to do nothing when it is called.

I hope this helps! Let me know if you have any questions.