SimpleCrypt/Crypto/src/test/java/CaesarTest.java

import org.junit.Assert;
import org.junit.Test;

import static org.junit.Assert.*;

public class CaesarTest {

    @Test
    public void rotateStringTest0() {
        // Given
        String s1 = "ABCDEF";
        String s2 = "ABCDEF";

        // When
        Caesar cipher = new Caesar();
        String actual = cipher.rotateByNumber(s1, 0);

        // Then
        assertTrue(actual.equals(s2));
    }

    @Test
    public void rotateStringTest1() {
        // Given
        String s1 = "ABCDEF";
        String s2 = "DEFABC";

        // When
        Caesar cipher = new Caesar();
        String actual = cipher.rotateByNumber(s1, 3);

        // Then
        assertTrue(actual.equals(s2));
    }

    @Test
    public void rotateStringTest2() {
        // Given
        String s1 = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
        String s2 = "NOPQRSTUVWXYZABCDEFGHIJKLM";

        // When
        Caesar cipher = new Caesar();
        String actual = cipher.rotateByNumber(s1, 13);
        System.out.println(s1);
        System.out.println(actual);
        // Then
        assertTrue(actual.equals(s2));
    }

    @Test
    public void cryptTest1() {
        // Given
        Caesar cipher = new Caesar(13);

        String Q1 = "Why did the chicken cross the road?";
        String A1 = "Jul qvq gur puvpxra pebff gur ebnq?";

        String Q2 = "Gb trg gb gur bgure fvqr!";
        String A2 = "To get to the other side!";

        // When
        String actual = cipher.encrypt(Q1);
        System.out.println(Q1);
        System.out.println(A1);
        // Then
        Assert.assertEquals(A1, actual);

        // When
        String actual2 = cipher.decrypt(Q2);
        System.out.println(Q2);
        System.out.println(A2);
        // Then
        Assert.assertEquals(A2, actual2);
    }

    @Test
    public void cryptTest2() {
        // Given
        Caesar cipher = new Caesar(4);

        String Q1 = "This is a test of Caesar.";
        String A1 = "Xlmw mw e xiwx sj geiwev.";

        String Q2 = "Ynulpo wna bqj!";
        String A2 = "Crypts are fun!";

        // When
        String actual = cipher.encrypt(Q1);
        System.out.println(Q1);
        System.out.println(A1);
        // Then
        Assert.assertEquals(A1, actual);

        // When
        String actual2 = cipher.decrypt(Q2);
        System.out.println(Q2);
        System.out.println(A2);
        // Then
        Assert.assertEquals(A2, actual2);
    }
}