@Test
public void containsIntegersWithinRange() {
Range range = new Range(1, 3);
assertThat(range.contains(1)).isTrue();
assertThat(range.contains(2)).isTrue();
assertThat(range.contains(3)).isTrue();
assertThat(range.contains(4)).isFalse();
}
@Test
public void failure() {
Range range = new Range(1, 3);
assertThat(range.contains(4)).isTrue();
}