const repeatString = require('./repeatString')

describe('repeatString', function() {
    it('repeats the string', function() {
        expect(repeatString('hey', 3)).toEqual('heyheyhey');
    });
    it('repeats the string many times', function() {
        expect(repeatString('hey', 10)).toEqual('heyheyheyheyheyheyheyheyheyhey');
    });
    it('repeats the string 1 times', function() {
        expect(repeatString('hey', 1)).toEqual('hey');
    });
    it('repeats the string 0 times', function() {
        expect(repeatString('hey', 0)).toEqual('');
    });
    it('returns ERROR with negative numbers', function() {
        expect(repeatString('hey', -1)).toEqual('ERROR');
    });
    it('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).*/
        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 randomaly generated. */
        expect(repeatString('hey', number).match(/((hey))/g).length).toEqual(number);
    });
    it('works with blank strings', function() {
        expect(repeatString('', 10)).toEqual('');
    });
});