index.test.js

const {
  arrow,
  defaultParameter,
  combineArrays,
  destructuring,
  templateString
} = require('./index')

test('function arrow is instance of a function', () => {
  expect(arrow).toBeInstanceOf(Function)
})

test('function arrow returns a string of es6 is awesome', () => {
  expect(arrow()).toEqual('es6 is awesome!')
})

test('defaultParameter function should return sam if no name argument passed in', () => {
  expect(defaultParameter()).toEqual('sam')
})

test('defaultParameter function should return name if name argument is passed in', () => {
  expect(defaultParameter('samatar')).toEqual('samatar')
})

test('combineArrays function should combine arr1 and arr2', () => {
  expect(combineArrays(arr1, arr2)).toEqual([1, 2, 3, 4, 5, 6])
})

test('destructuring function should return cyf property of object', () => {
  expect(destructuring(testObj)).toEqual('awesome')
})

test('templateString should return a string with the sum of parameter a and b', () => {
  expect(templateString(1, 2)).toEqual('The sum is equal to 3')
})
const arr1 = [1, 2, 3]
const arr2 = [4, 5, 6]
const testObj = {
  cyf: 'awesome',
  test: '100%',
  learning: 'always'
}