@Test
public void shouldReturnClosestPrimes()
{

    assertThat(Primes.closestPrimeTo(4), is(5));
    assertThat(Primes.closestPrimeTo(6), is(7));
    assertThat(Primes.closestPrimeTo(8), is(7));
    assertThat(Primes.closestPrimeTo(9), is(11));
    assertThat(Primes.closestPrimeTo(10), is(11));
    assertThat(Primes.closestPrimeTo(32), is(31));
}