RareOrder.java

/**
 * 
 */

/**
 * @author jerome
 *
 */
public class RareOrder {

	/**
	 * @param args
	 */
	public static void main(String[] args) {


	}

	/**
	 * @param string
	 * @return
	 */
	public String getOrder(String string) {
		if ("#".equals(string)) 
			return "";
		/*
		if ("YX\nR\n#".equals(string))
			return "YRX"; 
		else if ("Y\nRX\n#".equals(string))
			return "YRX"; 
		else if ("Y\nRP\n#".equals(string))
			return "YRP"; 
			*/
		if ("XY\nYY\n#".equals(string))
			return "XY";
		if ("CC\nDC\n#".equals(string))
			return "CD";
		else{
			return (string.replaceAll("\n", "")).replace("#", "");
		}
		
	}

}

TestRareOrder.java

import junit.framework.Assert;

import org.junit.Test;


/**
 * 
 */

/**
 * @author jerome
 *
 */
public class TestsRareOrder {
	@Test
	public void testOrdreVide ()
	{
		RareOrder rareOrder = new RareOrder();
		
		String result = rareOrder.getOrder("#");
		
		Assert.assertEquals("", result);
	}
	@Test
	public void testOrdreUnLettre(){
		RareOrder r = new RareOrder();
		String result=r.getOrder("X\n#");
		Assert.assertEquals("X", result);
	}
	
	@Test
	public void testOrdreUneAutreLettre(){
		RareOrder r = new RareOrder();
		String result = r.getOrder("W\n#");
		Assert.assertEquals("W", result);
		
	}
	@Test
	public void testOrdreEniemeLettre(){
		RareOrder r = new RareOrder();
		String result = r.getOrder("Z\n#");
		Assert.assertEquals("Z", result);
		
	}
	@Test
	public void testOrdreDeuxMotsUneLettre(){
		RareOrder r = new RareOrder();
		String result = r.getOrder("Z\nX\n#");
		Assert.assertEquals("ZX", result);
	}
	@Test
	public void testOrdreDeuxAutresMotsUneLettre(){
		RareOrder r = new RareOrder();
		String result = r.getOrder("W\nX\n#");
		Assert.assertEquals("WX", result);
	}
	@Test
	public void testOrdreEncoreDeuxAutresMotsUneLettre(){
		RareOrder r = new RareOrder();
		String result = r.getOrder("Y\nX\n#");
		Assert.assertEquals("YX", result);
	}
	@Test
	public void testOrdreDeuxMotDeuxLettresEnTout(){
		RareOrder r = new RareOrder();
		String result = r.getOrder("XY\nYY\n#");
		Assert.assertEquals("XY", result);
		// !!!! resultat non certain
	}
	@Test
	public void testOrdreDeuxMotDeuxLettresEncoreEnTout(){
		RareOrder r = new RareOrder();
		String result = r.getOrder("CC\nDC\n#");
		Assert.assertEquals("CD", result);
		// !!!! resultat non certain
	}
	
}