import randomId, { idWithUniqueSuffix } from './randomId';

describe('randomId', () => {
	it('should return a string of default length when no arguments are passed', () => {
		const result = randomId();
		expect(result).toHaveLength(21);
	});

	it('should return a string of specified length when an argument is provided', () => {
		const result = randomId(10);
		expect(result).toHaveLength(10);
	});

	it('should return unique values across multiple calls', () => {
		const sampleSize = 100;
		const ids = Array.from({ length: sampleSize }, randomId);
		const uniqueIds = new Set(ids);

		expect(uniqueIds.size).toEqual(sampleSize);
	});
});

describe('idWithUniqueSuffix', () => {
	it('should return an array', () => {
		const result = idWithUniqueSuffix();
		expect(result).toBeInstanceOf(Array);
	});

	it('should return a function (for the second value) that increments the suffix by 1 on each call', () => {
		const [randomStr, withUniqueSuffix] = idWithUniqueSuffix();

		const result1 = withUniqueSuffix();
		const result2 = withUniqueSuffix();
		const result3 = withUniqueSuffix();

		expect(result1).toBe(`${randomStr}-1`);
		expect(result2).toBe(`${randomStr}-2`);
		expect(result3).toBe(`${randomStr}-3`);
	});
});