IsEven { public boolean check(int n) { return (n & 1) != 1; }  boolean check(int n);  }
@Test public void shouldReturnTrueIfNumberIsZero() { assertTrue(isEven.check(0)); }
@Test public void shouldReturnTrueIfNumberIsEven() { assertTrue(isEven.check(68)); }
@Test public void shouldReturnFalseIfNumberIsOdd() { assertFalse(isEven.check(99)); }