    @Test
    public void givenAnActWhenDurationCalculatedThenCalculatedDurationIsDelegatedToTheViscosity() throws Exception {

        int timesTransitionViewed = 1;
        long currentDuration = 50L;

        calc.calculateNewDuration(mockViscosity, timesTransitionViewed, currentDuration);

        verify(mockViscosity).calculateDuration(currentDuration, timesTransitionViewed);
    }