odin-default-js-exercises/02_repeatString/solution/repeatString-solution.spec.js

const repeatString = require("./repeatString-solution");

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("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);
    /*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("odin", number).match(/((odin))/g).length).toEqual(number);
  });
  test("works with blank strings", () => {
    expect(repeatString("", 10)).toEqual("");
  });
});