electron/spec/api-native-image-spec.js

'use strict'

const assert = require('assert')
const nativeImage = require('electron').nativeImage
const path = require('path')

describe('nativeImage module', () => {
  describe('createFromPath(path)', () => {
    it('returns an empty image for invalid paths', () => {
      assert(nativeImage.createFromPath('').isEmpty())
      assert(nativeImage.createFromPath('does-not-exist.png').isEmpty())
      assert(nativeImage.createFromPath('does-not-exist.ico').isEmpty())
    })

    it('loads images from paths relative to the current working directory', () => {
      const imagePath = `.${path.sep}${path.join('spec', 'fixtures', 'assets', 'logo.png')}`
      const image = nativeImage.createFromPath(imagePath)
      assert(!image.isEmpty())
      assert.equal(image.getSize().height, 190)
      assert.equal(image.getSize().width, 538)
    })

    it('loads images from paths with `.` segments', () => {
      const imagePath = `${path.join(__dirname, 'fixtures')}${path.sep}.${path.sep}${path.join('assets', 'logo.png')}`
      const image = nativeImage.createFromPath(imagePath)
      assert(!image.isEmpty())
      assert.equal(image.getSize().height, 190)
      assert.equal(image.getSize().width, 538)
    })

    it('loads images from paths with `..` segments', () => {
      const imagePath = `${path.join(__dirname, 'fixtures', 'api')}${path.sep}..${path.sep}${path.join('assets', 'logo.png')}`
      const image = nativeImage.createFromPath(imagePath)
      assert(!image.isEmpty())
      assert.equal(image.getSize().height, 190)
      assert.equal(image.getSize().width, 538)
    })

    it('Gets an NSImage pointer on macOS', () => {
      if (process.platform !== 'darwin') return

      const imagePath = `${path.join(__dirname, 'fixtures', 'api')}${path.sep}..${path.sep}${path.join('assets', 'logo.png')}`
      const image = nativeImage.createFromPath(imagePath)
      const nsimage = image.getNativeHandle()

      assert.equal(nsimage.length, 8)

      // If all bytes are null, that's Bad
      assert.equal(nsimage.reduce((acc, x) => acc || (x !== 0), false), true)
    })

    it('loads images from .ico files on Windows', () => {
      if (process.platform !== 'win32') return

      const imagePath = path.join(__dirname, 'fixtures', 'assets', 'icon.ico')
      const image = nativeImage.createFromPath(imagePath)
      assert(!image.isEmpty())
      assert.equal(image.getSize().height, 256)
      assert.equal(image.getSize().width, 256)
    })
  })
})