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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("hello", 10)).toEqual(

"hellohellohellohellohellohellohellohellohellohello"

);

});

test("repeats the string 1 times", () => {

expect(repeatString("hi", 1)).toEqual("hi");

});

test("repeats the string 0 times", () => {

expect(repeatString("bye", 0)).toEqual("");

});

test("does not use the built-in String repeat method", () => {

/* Even though there is a built-in String repeat method,

in this exercise specifically, we want you to practise using loops */

jest

.spyOn(String.prototype, "repeat")

.mockName("Built-in String repeat method");

repeatString("don't use the built-in repeat method!", 1);

expect(String.prototype.repeat).not.toHaveBeenCalled();

});

test("returns ERROR with negative numbers", () => {

expect(repeatString("goodbye", -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);

expect(repeatString("hey", number)).toBe("hey".repeat(number));

});

test("works with blank strings", () => {

expect(repeatString("", 10)).toEqual("");

});

});