unit_test_application_code_spec.cy.js

/// <reference types="cypress" />

import fizzbuzz from '../../fizzbuzz'
// math exports a default object with methods
import math from '../../math'

describe('Unit Test Application Code', function () {
  const { add, divide, multiply, subtract } = math

  before(() => {
    // check if the import worked correctly
    expect(add, 'add').to.be.a('function')
  })

  context('math.js', function () {
    it('can add numbers', function () {
      expect(add(1, 2)).to.eq(3)
    })

    it('can subtract numbers', function () {
      expect(subtract(5, 12)).to.eq(-7)
    })

    it('can divide numbers', function () {
      expect(divide(27, 9)).to.eq(3)
    })

    it('can multiply numbers', function () {
      expect(multiply(5, 4)).to.eq(20)
    })
  })

  context('fizzbuzz.js', function () {
    function numsExpectedToEq (arr, expected) {
      // loop through the array of nums and make
      // sure they equal what is expected
      arr.forEach((num) => {
        expect(fizzbuzz(num)).to.eq(expected)
      })
    }

    it('returns "fizz" when number is multiple of 3', function () {
      numsExpectedToEq([9, 12, 18], 'fizz')
    })

    it('returns "buzz" when number is multiple of 5', function () {
      numsExpectedToEq([10, 20, 25], 'buzz')
    })

    it('returns "fizzbuzz" when number is multiple of both 3 and 5', function () {
      numsExpectedToEq([15, 30, 60], 'fizzbuzz')
    })
  })
})