Hash testing

Author: redomar

src/com/redomar/game/lib/HashGen.java

@@ -7,15 +7,16 @@ public class HashGen {
 	private String hexHash;
 	private boolean prefix;
 	private int hexLength;
+	private String previousHash;
 
 	/**
 	 * Use for generating a hex Hash. Requires two parameters;
 	 * @param showPrefix to show 0x prefix.
 	 * @param length Length of hash.
 	 */
 	public HashGen(boolean showPrefix, int length){
-		this.prefix = showPrefix;
-		this.hexLength = length;
+		setPrefix(showPrefix);
+		setHexLength(length);
 		init();
 	}
 
@@ -46,11 +47,27 @@ private void setHash(int hexLength){
 			hex = StringUtils.capitalize(hex);
 			hexHash = hexHash + hex;
 		}
+		previousHash = hexHash;
 
 	}
 
 	private int randNumGen(){
 		int rand = (int)(Math.random() * 16);
 		return rand;
 	}
+
+	//getters and setters
+
+	public void setPrefix(boolean prefix) {
+		this.prefix = prefix;
+	}
+
+	public void setHexLength(int hexLength) {
+		this.hexLength = hexLength;
+	}
+
+	public String getPreviousHash(){
+		if(previousHash == null) return null;
+		return previousHash;
+	}
 }

test/com/redomar/game/lib/HashTest.java

@@ -0,0 +1,64 @@
+package com.redomar.game.lib;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+public class HashTest {
+
+	private HashGen hashGen;
+
+	@Before
+	public void setUp() throws Exception{
+		hashGen = new HashGen(false,10);
+	}
+
+	@Test
+	public void hashNotEmpty(){
+		assertNotNull(hashGen.getHash());
+	}
+
+	@Test
+	public void hashZeroLengthNotNull(){
+		HashGen hg = new HashGen(false,0);
+		assertNotNull(hg.getHash());
+	}
+
+	@Test
+	public void compareHashAndPrevious_ShouldEqual(){
+		hashGen.setHexLength(8);
+		assertEquals(hashGen.getHash(), hashGen.getPreviousHash());
+	}
+
+	@Test
+	public void previousShouldDoesNotGenNewHash(){
+		assertEquals(hashGen.getPreviousHash(), hashGen.getPreviousHash());
+	}
+
+	@Test
+	public void hashLengthEqualsZero(){
+		HashGen hg = new HashGen(false, 0);
+		assertEquals(0,hg.getHash().length());
+	}
+
+	@Test
+	public void hashLengthEqualsGivenLength(){
+		HashGen hg = new HashGen(false, 80);
+		assertEquals(80, hg.getHash().length());
+	}
+
+	@Test
+	public void hashLengthEqualsSetLength(){
+		HashGen hg = new HashGen(false, 80);
+		hg.setHexLength(5);
+		assertEquals(5,hg.getHash().length());
+	}
+
+	@Test
+	public void hashPrefix(){
+		HashGen hg = new HashGen(true,0);
+		assertEquals("0x", hg.getHash());
+	}
+
+}