Javascript Factories for Tests

test-factories.js

const item = {
  type: 'something',
  age: 23,
  person: {
    name: 'Michael'
  }
}

const createItem = params => ({...item, ...params})

// default item with some expected attr set that can be reused
const itemWithBall = createItem({type: 'ball'}) 

// factory function to create itemWithBall with other params for other attrs
const createBallItem = params => ({...itemWithBall, ...params})

console.log(createBallItem({age: 245}))