diff --git a/src/test/java/com/thealgorithms/strings/LowerTest.java b/src/test/java/com/thealgorithms/strings/LowerTest.java
new file mode 100644
index 000000000..7e3ab762c
--- /dev/null
+++ b/src/test/java/com/thealgorithms/strings/LowerTest.java
@@ -0,0 +1,18 @@
+package com.thealgorithms.strings;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class LowerTest {
+    @Test
+    public void toLowerCase() {
+        String input1 = "hello world";
+        String input2 = "HelLO WoRld";
+        String input3 = "HELLO WORLD";
+        
+        assertEquals("hello world", Lower.toLowerCase(input1));
+        assertEquals("hello world", Lower.toLowerCase(input2));
+        assertEquals("hello world", Lower.toLowerCase(input3));
+    }
+}