Add tests for CoinChange

Author: jcazevedo

src/test/java/com/packt/datastructuresandalg/lesson4/activity/coinchange/CoinChangeTest.java

@@ -0,0 +1,25 @@
+package com.packt.datastructuresandalg.lesson4.activity.coinchange;
+
+import com.packt.datastructuresandalg.lesson4.activity.coinchange.solution.CoinChange;
+import junit.framework.TestCase;
+
+import java.util.Arrays;
+
+public class CoinChangeTest extends TestCase {
+    CoinChange change = new CoinChange();
+
+    public void test1() {
+        int[] coins = {1, 2, 3};
+        assertTrue(change.ways(4, coins) == 4);
+    }
+
+    public void test2() {
+        int[] coins = {2, 3, 5, 6};
+        assertTrue(change.ways(10, coins) == 5);
+    }
+
+    public void test3() {
+        int[] coins = {1, 5, 10, 25};
+        assertTrue(change.ways(63, coins) == 73);
+    }
+}