diff --git a/src/main/java/com/rampatra/strings/CompressString.java b/src/main/java/com/rampatra/strings/CompressString.java
index ed3ce3d1..1ff6c3ff 100644
--- a/src/main/java/com/rampatra/strings/CompressString.java
+++ b/src/main/java/com/rampatra/strings/CompressString.java
@@ -22,7 +22,7 @@ public class CompressString {
      * @param str the input string consisting on only alphabets
      * @return the compressed string
      */
-    private static String compress(String str) {
+    public static String compress(String str) {
         // some basic validation
         if (str.length() == 0) {
             throw new IllegalArgumentException("Empty String");
diff --git a/src/tests/UnitTesting.java b/src/tests/UnitTesting.java
new file mode 100644
index 00000000..2dc185e3
--- /dev/null
+++ b/src/tests/UnitTesting.java
@@ -0,0 +1,43 @@
+package tests;
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+
+public class MyClass {
+
+	
+	@Test
+	public void test_01() {
+		
+		//assertThrows()
+		assertThrows(IllegalArgumentException.class,() ->{
+			CompressString.compress("");
+			
+		});
+	}
+	@Test
+	public void test_02() {
+		
+		assertEquals("a2b",CompressString.compress("aab"));
+		
+	}
+	@Test
+	public void test_03() {
+		
+		assertEquals("ab",CompressString.compress("ab"));
+		
+	}
+	@Test
+	public void test_04() {
+		
+		assertEquals("abc",CompressString.compress("abc"));
+		
+	}
+	@Test
+	public void test_05() {
+		
+		assertEquals("abc2",CompressString.compress("abcc"));
+		
+	}
+
+}
\ No newline at end of file