TestPokerHand.java

/*******************************************************************************
 * Companion code for the book "Introduction to Software Design with Java" 
 * by Martin P. Robillard.
 *
 * Copyright (C) 2019 by Martin P. Robillard
 *
 * This code is licensed under a Creative Commons 
 * Attribution-NonCommercial-NoDerivatives 4.0 International License.
 * 
 * See http://creativecommons.org/licenses/by-nc-nd/4.0/
 *******************************************************************************/
package chapter5;

import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.junit.jupiter.api.Assertions.fail;

import java.lang.reflect.Method;

import org.junit.jupiter.api.Test;

public class TestPokerHand
{
	/*
	 * Helper method to reflectively invoke the private method 
	 * isStraightFlush() and return the result of the invocation.
	 */
	private boolean invokeIsStraightFlush(PokerHand pHand)
	{
		try
		{
			Method method = PokerHand.class.getDeclaredMethod("isStraightFlush");
			method.setAccessible(true);
			return (boolean) method.invoke(pHand);
		}
		catch(ReflectiveOperationException e)
		{
			e.printStackTrace();
			fail();
			return false;
		}
	}
	
	@Test
	public void testIsStraightFlush_True()
	{
		PokerHand hand = new PokerHand(Card.get(Rank.TWO, Suit.CLUBS),
				Card.get(Rank.THREE, Suit.CLUBS),
				Card.get(Rank.FOUR, Suit.CLUBS),
				Card.get(Rank.FIVE, Suit.CLUBS),
				Card.get(Rank.SIX, Suit.CLUBS));
		assertTrue(invokeIsStraightFlush(hand));
	}
	
	@Test
	public void testIsStraightFlush_WrongSuit()
	{
		PokerHand hand = new PokerHand(Card.get(Rank.TWO, Suit.CLUBS),
				Card.get(Rank.THREE, Suit.CLUBS),
				Card.get(Rank.FOUR, Suit.CLUBS),
				Card.get(Rank.FIVE, Suit.CLUBS),
				Card.get(Rank.SIX, Suit.DIAMONDS));
		assertFalse(invokeIsStraightFlush(hand));
	}
	
	@Test
	public void testIsStraightFlush_WrongRank()
	{
		PokerHand hand = new PokerHand(Card.get(Rank.TWO, Suit.CLUBS),
				Card.get(Rank.THREE, Suit.CLUBS),
				Card.get(Rank.FOUR, Suit.CLUBS),
				Card.get(Rank.FIVE, Suit.CLUBS),
				Card.get(Rank.SEVEN, Suit.CLUBS));
		assertFalse(invokeIsStraightFlush(hand));
	}
}