Test file of encapsulated es6 module private resources

es6-module-test.js

const assert = require('assert')
const rewire = require('rewire')

// standard using of exported functions
const { createUser } = require('./user')

// using rewire to get into private resources
const userRewire = rewire('./user')
const hasProp = userRewire.__get__('hasProp')
const hasProps = userRewire.__get__('hasProps')
const isString = userRewire.__get__('isString')
const arePropsStrings = userRewire.__get__('arePropsStrings')

const testObj = {
  name: 'John',
  lastname: 'Doe',
  age: 12,
  origin: 'USA'
}

describe('hasProp()', () => {
  it('Object has a prop "name"', () => {
    assert.strictEqual(true, hasProp(testObj, 'name'))
  })

  it('Object has a prop "age"', () => {
    assert.strictEqual(true, hasProp(testObj, 'age'))
  })

  it('Object has no such prop "country"', () => {
    assert.strictEqual(false, hasProp(testObj, 'country'))
  })

  it('Object has no such prop "xyz"', () => {
    assert.strictEqual(false, hasProp(testObj, 'xyz'))
  })
})

describe('hasProps()', () => {
  it('Object has props "name", "lastname"', () => {
    assert.strictEqual(true, hasProps(testObj, ['name', 'lastname']))
  })

  it('Object has props "age", "origin", "lastname', () => {
    assert.strictEqual(true, hasProps(testObj, ['age', 'origin', 'lastname']))
  })

  it('Object has not all props "age", "country"', () => {
    assert.strictEqual(false, hasProps(testObj, ['age', 'country']))
  })

  it('Object has not all props "lastname", "xyz", "age"', () => {
    assert.strictEqual(false, hasProps(testObj, ['lastname', 'xyz', 'age']))
  })
})

describe('isString()', () => {
  it('"xyz" is a string', () => {
    assert.strictEqual(true, isString('xyz'))
  })

  it('11 is not a string', () => {
    assert.strictEqual(false, isString(11))
  })

  it('null is not a string', () => {
    assert.strictEqual(false, isString(null))
  })

  it('[] is not a string', () => {
    assert.strictEqual(false, isString([]))
  })
})

describe('arePropsStrings()', () => {
  it('"name" and "lastname" are strings', () => {
    const wantedProps = ['name', 'lastname']
    assert.strictEqual(true, arePropsStrings(testObj, wantedProps))
  })

  it('"name" and "lastname" and "origin" are strings', () => {
    const wantedProps = ['name', 'lastname', 'origin']
    assert.strictEqual(true, arePropsStrings(testObj, wantedProps))
  })

  it('"age" is not a string ', () => {
    const wantedProps = ['name', 'age']
    assert.strictEqual(false, arePropsStrings(testObj, wantedProps))
  })

  it('"xyz" property doesnt\'t exists ', () => {
    const wantedProps = ['name', 'xyz']
    assert.strictEqual(false, arePropsStrings(testObj, wantedProps))
  })
})

describe('createUser()', () => {
  it('create user John Doe', () => {
    const user = createUser(testObj)
    assert.strictEqual('John', user.getName())
    assert.strictEqual('Doe', user.getLastName())
    assert.strictEqual('John Doe', user.getFullName())
  })

  it('create user Tom Johnson', () => {
    const user = createUser({
      name: 'Tom',
      lastname: 'Johnson'
    })
    assert.strictEqual('Tom', user.getName())
    assert.strictEqual('Johnson', user.getLastName())
    assert.strictEqual('Tom Johnson', user.getFullName())
  })

  it('Wrong user data no lastname data', () => {
    assert.throws(() => {
      createUser({name: 'Timothy'})
    }, Error)
  })

  it('Wrong user data  - empty object', () => {
    assert.throws(() => {
      createUser({})
    }, Error)
  })

  it('Wrong user data - numbers instead of strings ', () => {
    assert.throws(() => {
      createUser({name: 12, lastname: 14})
    }, Error)
  })
})