@Test
public void shouldBeSatisfiable() {

    assertThat(rangeHelper.isSatisfiable(Collections.singletonList(new Range(0, 0)), 1), is(true));
    assertThat(rangeHelper.isSatisfiable(Collections.singletonList(new Range(0, 1)), 2), is(true));
    assertThat(rangeHelper.isSatisfiable(Collections.singletonList(new Range(0, 2)), 3), is(true));
}