const repeatString = require('./repeatString');

describe('repeatString', () => {
	test('repeats the string', () => {
		expect(repeatString('hey', 3)).toEqual('heyheyhey');
	});
	test('repeats the string many times', () => {
		expect(repeatString('hey', 10)).toEqual('heyheyheyheyheyheyheyheyheyhey');
	});
	test('repeats the string 1 times', () => {
		expect(repeatString('hey', 1)).toEqual('hey');
	});
	test('repeats the string 0 times', () => {
		expect(repeatString('hey', 0)).toEqual('');
	});
	test('returns ERROR with negative numbers', () => {
		expect(repeatString('hey', -1)).toEqual('ERROR');
	});
	test('repeats the string a random amount of times', function () {
		/*The number is generated by using Math.random to get a value from between
    0 to 1, when this is multiplied by 1000 and rounded down with Math.floor it 
    equals a number between 0 to 999 (this number will change everytime you run
    the test).*/

		// DO NOT use Math.floor(Math.random() * 1000) in your code,
		// this test generates a random number, then passes it into your code with a function parameter.
		// If this doesn't make sense, you should go read about functions here: https://www.theodinproject.com/paths/foundations/courses/foundations/lessons/fundamentals-part-3
		const number = Math.floor(Math.random() * 1000);
		/*The .match(/((hey))/g).length is a regex that will count the number of heys
    in the result, which if your function works correctly will equal the number that
    was randomly generated. */
		expect(repeatString('hey', number).match(/((hey))/g).length).toEqual(number);
	});
	test('works with blank strings', () => {
		expect(repeatString('', 10)).toEqual('');
	});
});