diff --git a/src/main/java/com/ctci/arraysandstrings/IsUnique.java b/src/main/java/com/ctci/arraysandstrings/IsUnique.java
index 895d16b3..4a1d54ee 100644
--- a/src/main/java/com/ctci/arraysandstrings/IsUnique.java
+++ b/src/main/java/com/ctci/arraysandstrings/IsUnique.java
@@ -6,7 +6,7 @@
  */
 public class IsUnique {
 
-    private static boolean hasAllUniqueCharacters(String str) {
+    public static boolean hasAllUniqueCharacters(String str) {
         if (str == null || str.length() > 128) return false;
 
         boolean[] charSet = new boolean[128]; // assuming the string contains only ASCII characters
@@ -20,7 +20,7 @@ private static boolean hasAllUniqueCharacters(String str) {
         return true;
     }
 
-    private static boolean hasAllUniqueCharactersWhenStringContainsAllLowercase(String s) {
+    public static boolean hasAllUniqueCharactersWhenStringContainsAllLowercase(String s) {
         int checker = 0;
         for (int i = 0; i < s.length(); i++) {
             int charValue = s.charAt(i) - 'a';
diff --git a/src/main/java/com/ctci/arraysandstrings/TestIsUnique.java b/src/main/java/com/ctci/arraysandstrings/TestIsUnique.java
new file mode 100644
index 00000000..3d85d200
--- /dev/null
+++ b/src/main/java/com/ctci/arraysandstrings/TestIsUnique.java
@@ -0,0 +1,34 @@
+package com.ctci.arraysandstrings;
+
+import org.junit.Test;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+public class TestIsUnique {
+	@Test
+	public void TesthasAllUniqueCharacters() {
+		String TC1 = "qwertyuiop123456@#$%";
+		String TC2 = "aaaaaaaaa";
+		
+		boolean R1 = IsUnique.hasAllUniqueCharacters(TC1);
+		boolean R2 = IsUnique.hasAllUniqueCharacters(TC2);
+		
+		assertTrue(R1);
+		assertFalse(R2);
+	}
+	@Test
+	public void TesthasAllUniqueCharactersWhenStringContainsAllLowercase() {
+		String TC1 = "qwertyuiop";
+		String TC2 = "aaaaaaaaa";
+		String TC3 = "QwertHfakjf";
+		
+		boolean R1 = IsUnique.hasAllUniqueCharactersWhenStringContainsAllLowercase(TC1);
+		boolean R2 = IsUnique.hasAllUniqueCharactersWhenStringContainsAllLowercase(TC2);
+		boolean R3 = IsUnique.hasAllUniqueCharactersWhenStringContainsAllLowercase(TC3);
+		
+		assertTrue(R1);
+		assertFalse(R2);
+		assertFalse(R3);
+
+	}
+}
diff --git a/src/main/java/com/ctci/arraysandstrings/testMain.java b/src/main/java/com/ctci/arraysandstrings/testMain.java
new file mode 100644
index 00000000..13bdcdc6
--- /dev/null
+++ b/src/main/java/com/ctci/arraysandstrings/testMain.java
@@ -0,0 +1,15 @@
+package com.ctci.arraysandstrings;
+
+import org.junit.runner.JUnitCore;
+import org.junit.runner.Result;
+import org.junit.runner.notification.Failure;
+
+public class testMain {
+	public static void main(String[] args) {
+		Result result = JUnitCore.runClasses(TestIsUnique.class);
+		for (Failure failure: result.getFailures()) {
+			System.out.println(failure.toString());
+		}
+		System.out.println(result.wasSuccessful());
+	}
+}
\ No newline at end of file