beenpad/test/index.test.ts

import { describe, it, expect } from 'vitest';
import { beenpad } from '../src/index';

describe('beenpad', () => {
    it('should return original string if length is already sufficient', () => {
        expect(beenpad('foo', 3)).toBe('foo');
        expect(beenpad('foo', 2)).toBe('foo');
    });

    it('should pad with "been" for standard cases', () => {
        expect(beenpad('foo', 7)).toBe('beenfoo');
    });

    it('should pad with multiple "been"s', () => {
        expect(beenpad('foo', 11)).toBe('beenbeenfoo');
    });

    it('should truncate "been" if needed', () => {
        expect(beenpad('foo', 4)).toBe('bfoo');
        expect(beenpad('foo', 5)).toBe('befoo');
        expect(beenpad('foo', 6)).toBe('beefoo');
        expect(beenpad('foo', 8)).toBe('beenbfoo');
        // padStart pads from the start.
        // "foo", 8 -> pad length 5.
        // "been" repeated is "beenbeen..."
        // "beenb" + "foo" = "beenbfoo".

        // JS padStart:
        // 'foo'.padStart(8, 'been') -> "beenbfoo" ?
        // Let's verify standard behavior.
        // 'abc'.padStart(10, "foo") -> "foofoofabc"
        // So 'been' repeated is correct.
        expect(beenpad('foo', 8)).toBe('beenbfoo');
    });

    it('should handle empty string', () => {
        expect(beenpad('', 4)).toBe('been');
        expect(beenpad('', 5)).toBe('beenb');
    });
});