// mergeDifferentDurationTest(): m1, m2 different duration
@Test
public void mergeDifferentDurationTest() {
Merge a = new Merge(new Rest(1), new Note(5, new Pitch('A')));
assertTrue(6 == a.duration());
}
// mergeSameDurationTest(): m1, m2 same duration
@Test
public void mergeSameDurationTest() {
Merge a = new Merge(new Rest(5), new Note(5, new Pitch('A')));
assertTrue(10 == a.duration());
}