diff --git a/src/test/java/com/thealgorithms/strings/AlphabeticalTest.java b/src/test/java/com/thealgorithms/strings/AlphabeticalTest.java
new file mode 100644
index 000000000000..a7316b83f65b
--- /dev/null
+++ b/src/test/java/com/thealgorithms/strings/AlphabeticalTest.java
@@ -0,0 +1,30 @@
+package com.thealgorithms.strings;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+
+public class AlphabeticalTest {
+ @Test
+ public void isAlphabetical() {
+ // expected to be true
+ String input1 = "abcdefghijklmno";
+ String input2 = "abcdxxxyzzzz";
+ String input3 = "fpw";
+
+ // expected to be false
+ String input4 = "123a";
+ String input5 = "abcABC";
+ String input6 = "abcdefghikjlmno";
+
+ assertTrue(Alphabetical.isAlphabetical(input1));
+ assertTrue(Alphabetical.isAlphabetical(input2));
+ assertTrue(Alphabetical.isAlphabetical(input3));
+
+ assertFalse(Alphabetical.isAlphabetical(input4));
+ assertFalse(Alphabetical.isAlphabetical(input5));
+ assertFalse(Alphabetical.isAlphabetical(input6));
+ }
+
+}
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