I have a class A with a publish() method. In the method will call another method and pass the class A object as a parameter to Class B.
public class A { public void publish() { ClassB classb = new ClassB(); classb.sendRequest(this) } } The question is how to use Mockito to verify the sendRequest method is called when the publish() method is called? I am new to Mockito.
You can't use Mockito if you create a new ClassB instance in your method.
You should refactor publish() to take ClassB as a parameter, and then you can send your Mockito mock instead of a real ClassB, and verify on it.
Like so:
public class A { public void publish(ClassB classb){ classb.sendRequest(this) } } And in your test:
ClassB mockClassB = mock(ClassB.class); A a = new A(); a.publish(mockClassB); verify(mockClassB, times(1)).sendRequest(any()); 
As publish method does is calling a method on its parameter passing itself along the question arises: Why does it need to be in class A? could't the caller of a.publish(b); call b.sendRequest(a); directly? That would remove the dependency of class A to class B completely...