JavaScript FizzBuzz
July 04, 2018
This blog assumes a global install of mocha
, although that can also be installed locally. chai
is also required as the assertion library - install as a dev dependency.
Writing tests
Create fizzbuzz.mocha.js
.
const lib = require("./index")
const chai = require("chai")
const { expect } = chai
describe("check basic function", function() {
it("should return when not part of fizz buzz", function() {
const res = lib.run(2)
expect(res).to.equal(2)
})
it("should return fizz", function() {
const res = lib.run(3)
expect(res).to.equal("Fizz")
})
it("should return buzz", function() {
const res = lib.run(5)
expect(res).to.equal("Buzz")
})
it("should return fizzbuzz", function() {
const res = lib.run(15)
expect(res).to.equal("FizzBuzz")
})
})
Main js file
Create index.js
:
const run = arg => {
switch (true) {
case arg % 15 === 0:
return "FizzBuzz"
case arg % 3 === 0:
return "Fizz"
case arg % 5 === 0:
return "Buzz"
default:
return arg
}
}
module.exports = {
run,
}
Testing
Change into directory and run mocha fizzbuzz.mocha.js
.
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A personal blog on all things of interest. Written by Dennis O'Keeffe, Follow me on Twitter