omni-tools/src/pages/string/create-palindrome/create-palindrome.service.test.ts

import { expect, describe, it } from 'vitest';
 import { createPalindromeList, createPalindrome } from './service';

describe('createPalindrome', () => {
    test('should create palindrome by reversing the entire string', () => {
        const input = 'hello';
        const result = createPalindrome(input, true);
        expect(result).toBe('helloolleh');
    });

    test('should create palindrome by reversing the string excluding the last character', () => {
        const input = 'hello';
        const result = createPalindrome(input, false);
        expect(result).toBe('hellolleh');
    });

    test('should return an empty string if input is empty', () => {
        const input = '';
        const result = createPalindrome(input, true);
        expect(result).toBe('');
    });
});

describe('createPalindromeList', () => {
    test('should create palindrome for single-line input', () => {
        const input = 'hello';
        const result = createPalindromeList(input, true, false);
        expect(result).toBe('helloolleh');
    });

    test('should create palindrome for single-line input considering trailing spaces', () => {
        const input = 'hello ';
        const result = createPalindromeList(input, true, false);
        expect(result).toBe('hello  olleh');
    });

    test('should create palindrome for single-line input ignoring trailing spaces if lastChar is set to false', () => {
        const input = 'hello ';
        const result = createPalindromeList(input, true, false);
        expect(result).toBe('hello  olleh');
    });

    test('should create palindrome for multi-line input', () => {
        const input = 'hello\nworld';
        const result = createPalindromeList(input, true, true);
        expect(result).toBe('helloolleh\nworlddlrow');
    });

    test('should create palindrome for no multi-line input', () => {
        const input = 'hello\nworld\n';
        const result = createPalindromeList(input, true, false);
        expect(result).toBe('hello\nworld\n\ndlrow\nolleh');
    });

    test('should handle multi-line input with lastChar set to false', () => {
        const input = 'hello\nworld';
        const result = createPalindromeList(input, false, true);
        expect(result).toBe('hellolleh\nworldlrow');
    });

    test('should return an empty string if input is empty', () => {
        const input = '';
        const result = createPalindromeList(input, true, false);
        expect(result).toBe('');
    });
});