@Test
public void testBuildShuffledDeck() {

    Dealer dealer = new Dealer();
    int numCards = 4;
    
    // test
    List<Integer> result = dealer.buildShuffledDeck(numCards);
    
    assertEquals(4, result.size());
    assertTrue(result.contains(1));
    assertTrue(result.contains(2));
    assertTrue(result.contains(3));
    assertTrue(result.contains(4));
}