Add BaconianCipher (#5932)

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

@@ -0,0 +1,34 @@
+package com.thealgorithms.ciphers;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Test;
+
+class BaconianCipherTest {
+
+    BaconianCipher baconianCipher = new BaconianCipher();
+
+    @Test
+    void baconianCipherEncryptTest() {
+        // given
+        String plaintext = "MEET AT DAWN";
+
+        // when
+        String cipherText = baconianCipher.encrypt(plaintext);
+
+        // then
+        assertEquals("ABBAAAABAAAABAABAABBAAAAABAABBAAABBAAAAABABBAABBAB", cipherText);
+    }
+
+    @Test
+    void baconianCipherDecryptTest() {
+        // given
+        String ciphertext = "ABBAAAABAAAABAABAABBAAAAABAABBAAABBAAAAABABBAABBAB";
+
+        // when
+        String plainText = baconianCipher.decrypt(ciphertext);
+
+        // then
+        assertEquals("MEETATDAWN", plainText);
+    }
+}