react-native-version.test.js

const boilerplate = require('../lib/react-native-version')

// grab a few things from the boilerplate module
const get = boilerplate.getReactNativeVersion
const DEFAULT = boilerplate.REACT_NATIVE_VERSION

/**
 * Runs with a valid gluegun context and a staged version number.
 *
 * @param {*} reactNativeVersion The React Native version to use.
 * @return {string} The version number we should be using.
 */
const mock = reactNativeVersion => get({
  parameters: {
    options: {
      'react-native-version': reactNativeVersion
    }
  }
})

// this would only happen if we screwed something up in our boilerplate.js
test('it handles strange inputs from code', () => {
  expect(get()).toBe(DEFAULT)
  expect(get(null)).toBe(DEFAULT)
  expect(get(true)).toBe(DEFAULT)
  expect(get(8)).toBe(DEFAULT)
  expect(get('hello')).toBe(DEFAULT)
  expect(get([])).toBe(DEFAULT)
  expect(get({})).toBe(DEFAULT)
  expect(get(() => true)).toBe(DEFAULT)
})

// this could happen because it's valid input via minimist from the user
test('it handles strange input from the user', () => {
  expect(mock(true)).toBe(DEFAULT)
  expect(mock(false)).toBe(DEFAULT)
  expect(mock([])).toBe(DEFAULT)
  expect(mock({})).toBe(DEFAULT)
})

// very edge-casey
test('it handles not-quite semver numbers', () => {
  expect(mock(0)).toBe(DEFAULT)
  expect(mock(0.25)).toBe(DEFAULT)
})

// happy path
test('it handles valid versions', () => {
  expect(mock('0.41.0')).toBe('0.41.0')
  expect(mock('0.41.0-beta.1')).toBe('0.41.0-beta.1')
  expect(mock(DEFAULT)).toBe(DEFAULT)
  expect(mock('next')).toBe('next')
})