TDD example

Blackjack.java

package main;

public class Blackjack {
	public static int play(int hand1, int hand2) {
		if (hand1 > 21 && hand2 > 21) {
			return 0;
		} else if (hand1 > 21) {
			return hand2;
		} else if (hand2 > 21) {
			return hand1;
		}
		return Math.max(hand1, hand2);
	}
}

BlackjackTest.java

public class BlackJackTest {

	private BlackJack blackJack;

	@Before
	public void init() {
		this.blackJack = new BlackJack();
	}

	@Test
	public void testHighestWins() {
		assertEquals("Highest number has not won.", 20, this.blackJack.findWinningHand(20, 0));
	}

	@Test
	public void testOneBust() {
		assertEquals("Player one has gone bust and still won", 15, this.blackJack.findWinningHand(25, 15));
	}
	
	@Test
	public void testTwoBust() {
		assertEquals("Player two has gone bust and still won", 15, this.blackJack.findWinningHand(15, 25));
	}
	
	@Test
	public void testBothBust() {
		assertEquals("Both players have gonw bust but one of them still won", 0, this.blackJack.findWinningHand(25, 25));
	}
}