How to use class member variables inside Junit-Mockito tests

Question

class MyClass {
    MyErrorServiceList myErrorServiceList; // myErrorServiceList is initialized by some complex method calls
    
    public boolean processErrorServiceList() {
        if (CollectionUtils.NotEmplty(myErrorServiceList)) {
            // do something
            return true;
        } else { 
            return false;
        }
    }
}

How can I pass myErrorServiceList when calling processErrorServiceList() so that both branches of the code are covered by a test case?

Answer 1

use ReflectionTestUtils.setField method