@Test
 public void testShouldReturnZeroWhenCardsAreTheSmae() {
   // given
   PairComparatorBySuit comparePairs = new PairComparatorBySuit();
   Card cardOne = new Card(10, 37);
   Card cardTwo = new Card(10, 37);
   // when
   int result = comparePairs.compare(cardOne, cardTwo);
   // then
   assertEquals(0, result);
 }
 @Test
 public void testShouldReturnMinusOneWhenFirstCardIsHigherThanSecond() {
   // given
   PairComparatorBySuit comparePairs = new PairComparatorBySuit();
   Card cardOne = new Card(12, 37);
   Card cardTwo = new Card(10, 37);
   // when
   int result = comparePairs.compare(cardOne, cardTwo);
   // then
   assertEquals(-1, result);
 }
 @Test
 public void testShouldReturnOneWhenFirstPairIsLower() {
   // given
   PairComparatorBySuit comparePairs = new PairComparatorBySuit();
   Card cardOne = new Card(8, 37);
   Card cardTwo = new Card(10, 37);
   // when
   int result = comparePairs.compare(cardOne, cardTwo);
   // then
   assertEquals(1, result);
 }