Create MonoAlphabeticTest.java

Author: riti2601

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

@@ -0,0 +1,61 @@
+package com.thealgorithms.ciphers;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+public class MonoAlphabeticTest {
+    private MonoAlphabetic monoAlphabetic;
+
+    @BeforeEach
+    public void setUp() {
+        // Initialize the MonoAlphabetic cipher with a sample key
+        String key = "QWERTYUIOPASDFGHJKLZXCVBNM"; // Example key
+        monoAlphabetic = new MonoAlphabetic(key);
+    }
+
+    @Test
+    public void testEncrypt() {
+        String plaintext = "HELLO";
+        String expectedCiphertext = "ITSSG"; // Expected result based on the key
+        String actualCiphertext = monoAlphabetic.encrypt(plaintext);
+        
+        assertEquals(expectedCiphertext, actualCiphertext, "Encryption should match the expected ciphertext.");
+    }
+
+    @Test
+    public void testDecrypt() {
+        String ciphertext = "ITSSG";
+        String expectedPlaintext = "HELLO"; // Expected result based on the key
+        String actualPlaintext = monoAlphabetic.decrypt(ciphertext);
+        
+        assertEquals(expectedPlaintext, actualPlaintext, "Decryption should match the expected plaintext.");
+    }
+
+    @Test
+    public void testEncryptAndDecrypt() {
+        String plaintext = "HELLO";
+        String ciphertext = monoAlphabetic.encrypt(plaintext);
+        String decryptedText = monoAlphabetic.decrypt(ciphertext);
+        
+        assertEquals(plaintext, decryptedText, "Decrypting the ciphertext should return the original plaintext.");
+    }
+
+    @Test
+    public void testEncryptWithSpecialCharacters() {
+        String plaintext = "HELLO, WORLD!";
+        String expectedCiphertext = "ITSSG, GQHSG!";
+        String actualCiphertext = monoAlphabetic.encrypt(plaintext);
+        
+        assertEquals(expectedCiphertext, actualCiphertext, "Encryption should correctly handle special characters.");
+    }
+
+    @Test
+    public void testDecryptWithSpecialCharacters() {
+        String ciphertext = "ITSSG, GQHSG!";
+        String expectedPlaintext = "HELLO, WORLD!";
+        String actualPlaintext = monoAlphabetic.decrypt(ciphertext);
+        
+        assertEquals(expectedPlaintext, actualPlaintext, "Decryption should correctly handle special characters.");
+    }
+}