Nov 12, 2025 · Nov 12, 2025 · Nov 12, 2025 · Nov 12, 2025 · Nov 12, 2025 · Nov 15, 2025
diff --git a/src/test/java/com/thealgorithms/ciphers/ElGamalCipherTest.java b/src/test/java/com/thealgorithms/ciphers/ElGamalCipherTest.java
 package com.thealgorithms.ciphers;

 import static org.junit.jupiter.api.Assertions.*;
 import org.junit.jupiter.api.Test;

 public class ElGamalCipherTest {

    @Test
    void testEncryptThenDecrypt_returnsOriginal() {
        ElGamalCipher elg = new ElGamalCipher();

        String original = "HelloElGamal123";
        String encrypted = elg.encrypt(original);
        assertNotNull(encrypted);

        String decrypted = elg.decrypt(encrypted);
        assertEquals(original, decrypted);
    }

    @Test
    void testEncryptedIsDifferentFromOriginal() {
        ElGamalCipher elg = new ElGamalCipher();
        String encrypted = elg.encrypt("TestData");
        assertNotEquals("TestData", encrypted);
    }

    @Test
    void testEmptyString() {
        ElGamalCipher elg = new ElGamalCipher();
        String encrypted = elg.encrypt("");
        String decrypted = elg.decrypt(encrypted);
        assertEquals("", decrypted);
    }

    @Test
    void testNullInputs() {
        ElGamalCipher elg = new ElGamalCipher();
        assertThrows(IllegalArgumentException.class, () -> elg.encrypt(null));
        assertThrows(IllegalArgumentException.class, () -> elg.decrypt(null));
    }
 }
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,41 @@
		package com.thealgorithms.ciphers;

		import static org.junit.jupiter.api.Assertions.*;
		import org.junit.jupiter.api.Test;

		public class ElGamalCipherTest {

		@Test
		void testEncryptThenDecrypt_returnsOriginal() {
		ElGamalCipher elg = new ElGamalCipher();

		String original = "HelloElGamal123";
		String encrypted = elg.encrypt(original);
		assertNotNull(encrypted);

		String decrypted = elg.decrypt(encrypted);
		assertEquals(original, decrypted);
		}

		@Test
		void testEncryptedIsDifferentFromOriginal() {
		ElGamalCipher elg = new ElGamalCipher();
		String encrypted = elg.encrypt("TestData");
		assertNotEquals("TestData", encrypted);
		}

		@Test
		void testEmptyString() {
		ElGamalCipher elg = new ElGamalCipher();
		String encrypted = elg.encrypt("");
		String decrypted = elg.decrypt(encrypted);
		assertEquals("", decrypted);
		}

		@Test
		void testNullInputs() {
		ElGamalCipher elg = new ElGamalCipher();
		assertThrows(IllegalArgumentException.class, () -> elg.encrypt(null));
		assertThrows(IllegalArgumentException.class, () -> elg.decrypt(null));
		}
		}