diff --git a/DIRECTORY.md b/DIRECTORY.md
index 90b26ae98797..4b98173a4e85 100644
--- a/DIRECTORY.md
+++ b/DIRECTORY.md
@@ -636,6 +636,7 @@
* [A5CipherTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/ciphers/a5/A5CipherTest.java)
* [A5KeyStreamGeneratorTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/ciphers/a5/A5KeyStreamGeneratorTest.java)
* [LFSRTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/ciphers/a5/LFSRTest.java)
+ * [AESEncryptionTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/ciphers/AESEncryptionTest.java)
* [AutokeyTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/ciphers/AutokeyTest.java)
* [BlowfishTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/ciphers/BlowfishTest.java)
* [CaesarTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/ciphers/CaesarTest.java)
diff --git a/src/test/java/com/thealgorithms/ciphers/AESEncryptionTest.java b/src/test/java/com/thealgorithms/ciphers/AESEncryptionTest.java
new file mode 100644
index 000000000000..2f0831e35064
--- /dev/null
+++ b/src/test/java/com/thealgorithms/ciphers/AESEncryptionTest.java
@@ -0,0 +1,62 @@
+package com.thealgorithms.ciphers;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import javax.crypto.SecretKey;
+import org.junit.jupiter.api.Test;
+
+public class AESEncryptionTest {
+
+ @Test
+ public void testGetSecretEncryptionKey() throws Exception {
+ SecretKey key = AESEncryption.getSecretEncryptionKey();
+ assertNotNull(key, "Secret key should not be null");
+ assertEquals(128, key.getEncoded().length * 8, "Key size should be 128 bits");
+ }
+
+ @Test
+ public void testEncryptText() throws Exception {
+ String plainText = "Hello World";
+ SecretKey secKey = AESEncryption.getSecretEncryptionKey();
+ byte[] cipherText = AESEncryption.encryptText(plainText, secKey);
+
+ assertNotNull(cipherText, "Ciphertext should not be null");
+ assertTrue(cipherText.length > 0, "Ciphertext should not be empty");
+ }
+
+ @Test
+ public void testDecryptText() throws Exception {
+ String plainText = "Hello World";
+ SecretKey secKey = AESEncryption.getSecretEncryptionKey();
+ byte[] cipherText = AESEncryption.encryptText(plainText, secKey);
+
+ // Decrypt the ciphertext
+ String decryptedText = AESEncryption.decryptText(cipherText, secKey);
+
+ assertNotNull(decryptedText, "Decrypted text should not be null");
+ assertEquals(plainText, decryptedText, "Decrypted text should match the original plain text");
+ }
+
+ @Test
+ public void testEncryptDecrypt() throws Exception {
+ String plainText = "Hello AES!";
+ SecretKey secKey = AESEncryption.getSecretEncryptionKey();
+
+ // Encrypt the plaintext
+ byte[] cipherText = AESEncryption.encryptText(plainText, secKey);
+
+ // Decrypt the ciphertext
+ String decryptedText = AESEncryption.decryptText(cipherText, secKey);
+
+ assertEquals(plainText, decryptedText, "Decrypted text should match the original plain text");
+ }
+
+ @Test
+ public void testBytesToHex() {
+ byte[] bytes = new byte[] {0, 1, 15, 16, (byte) 255}; // Test with diverse byte values
+ String hex = AESEncryption.bytesToHex(bytes);
+ assertEquals("00010F10FF", hex, "Hex representation should match the expected value");
+ }
+}
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