Added ADFGVXCipherTest.java

Author: bennybebo

src/main/java/com/thealgorithms/ciphers/ADFGVXCipher.java

@@ -15,8 +15,8 @@
  */
 public class ADFGVXCipher {
 
-    private static final char[] POLYBIUS_LETTERS = {'A', 'D', 'F', 'G', 'V', 'X'};
-    private static final char[][] POLYBIUS_SQUARE = {{'P', 'H', '0', 'Q', 'G', '6'}, {'4', 'M', 'E', 'A', '1', 'Y'}, {'L', '2', 'N', 'O', 'F', 'D'}, {'X', 'K', 'R', '3', 'C', 'V'}, {'S', '5', 'Z', 'W', '7', 'B'}, {'J', '9', 'U', 'T', 'I', '8'}};
+	private static final char[] POLYBIUS_LETTERS = {'A', 'D', 'F', 'G', 'V', 'X'};
+    private static final char[][] POLYBIUS_SQUARE = {{'N', 'A', '1', 'C', '3', 'H'}, {'8', 'T', 'B', '2', 'O', 'M'}, {'E', '5', 'W', 'R', 'P', 'D'}, {'4', 'F', '6', 'G', '7', 'I'}, {'9', 'J', '0', 'K', 'L', 'Q'}, {'S', 'U', 'V', 'X', 'Y', 'Z'}};
     private static final Map<String, Character> POLYBIUS_MAP = new HashMap<>();
     private static final Map<Character, String> REVERSE_POLYBIUS_MAP = new HashMap<>();
 
@@ -31,7 +31,7 @@ public class ADFGVXCipher {
     }
 
     // Encrypts the plaintext using the ADFGVX cipher
-    public String encrypt(String plaintext, String key) {
+    private String encrypt(String plaintext, String key) {
         plaintext = plaintext.toUpperCase().replaceAll("[^A-Z0-9]", "");
         StringBuilder fractionatedText = new StringBuilder();
 
@@ -45,7 +45,7 @@ public String encrypt(String plaintext, String key) {
     }
 
     // Decrypts the ciphertext using the ADFGVX cipher
-    public String decrypt(String ciphertext, String key) {
+    private String decrypt(String ciphertext, String key) {
         // Step 1: Reverse the columnar transposition
         String fractionatedText = reverseColumnarTransposition(ciphertext, key);
 
@@ -120,4 +120,4 @@ private String reverseColumnarTransposition(String ciphertext, String key) {
 
         return fractionatedText.toString();
     }
-}
+}

src/test/java/com/thealgorithms/ciphers/ADFGVXCipherTest.java

@@ -0,0 +1,36 @@
+package com.thealgorithms.ciphers;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Test;
+
+class ADFGVXCipher {
+
+	ADFGVXCipher adfgvxCipher = new ADFGVXCipher();
+
+    @Test
+    void adfgvxCipherEncryptTest() {
+        // given
+        String message = "attack at 1200am"; // Plaintext message
+        String keyword = "PRIVACY";
+
+        // when
+        String cipherText = hillCipher.encrypt(message, keyword);
+
+        // then
+        assertEquals("DGDDDAGDDGAFADDFDADVDVFAADVX", cipherText);
+    }
+
+    @Test
+    void adfgvxCipherDecryptTest() {
+        // given
+        String cipherText = "DGDDDAGDDGAFADDFDADVDVFAADVX"; // Ciphertext message
+        String keyword = "PRIVACY";
+
+        // when
+        String plainText = hillCipher.decrypt(cipherText, keyword);
+
+        // then
+        assertEquals("ATTACKAT1200AM", plainText);
+    }
+}