### Question:
TimeSum { public void reset() { hours = 0; minutes = 0; }  void set(int hours, int minutes); void add(int hoursToAdd, int minutesToAdd); void substract(int hoursToSubstract, int minutesToSubstract); void addOrSubstract(TimeSum timeSum); @Override String toString(); int getAsMinutes(); void reset();  }### Answer:
@Test public void reset() { set(-1, 0); underTest.reset(); assertTime("0:00"); }