UnnecessaryStubbingException:
  Unnecessary stubbings detected.
  Clean & maintainable test code requires zero unnecessary code.
  Following stubbings are unnecessary (click to navigate to relevant line of code):
    1. -> at lab.mockito.StrictnessTest.unusedStubIsReportedWhenTheSessionEnds(StrictnessTest.java:33)
  Please remove unnecessary stubbings or use 'lenient' strictness. More info: javadoc for UnnecessaryStubbingException class.