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repeatString.spec.js

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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('');

});

});