@Test public void getFinalSpanName_returns_null_and_does_nothing_else() { // when String result = implSpy.getFinalSpanName(requestMock, responseMock); // then assertThat(result).isNull(); verify(implSpy).getFinalSpanName(requestMock, responseMock); verifyNoMoreInteractions(implSpy); verifyZeroInteractions(requestMock, responseMock); }