@applitools/visual-grid-client

visual-grid-client

A library that drives the visual grid with dom snapshot rendering.

Installing

npm install @applitools/visual-grid-client

Using the package

const {makeVisualGridClient, initConfig} = require('@applitools/visual-grid-client')
const domNodesToCdt = require('@applitools/visual-grid-client/src/browser-util/domNodesToCdt')

See below for the full API.

API

makeVisualGridClient

• To create a visualGridClient, call makeVisualGridClient:

const {makeVisualGridClient, initConfig} = require('@applitools/visual-grid-client')
const visualGridClient = makeVisualGridClient({...initConfig(),
                                              showLogs: true,
                                              renderStatusTimeout: 60000, renderStatusInterval: 1000})

Where:

• showLogs is obvious from name. See "Logs" section for details on the logs generated by the visual grid client.
• renderStatusTimeout defines the time to wait for a rendering to finish before giving up and calling it a failure.
• renderStatusInterval defines the time to wait between polling for a rendering's status.

The visualGridClient, returned by makeVisualGridClient, is an object with three functions:

• openEyes(configOverride): to start a set of tests, where each step is a set of renderings according to the browser stuff in the configuration. This function will return an object with functions (see below) allowing you to create renderings (or "steps" in Applitools parlance) for the test.
• waitForTestResults(promises[]): A convenience async function. Pass a set of promises returned by the various close-es of openEyes, and it will wait on all of them and return an array of results, or throw if there was a difference detected in one of the close-s.
• getError(): This function will return an error if there was one during the running of the tests. Poll it sometimes to see if you need to abort anything.

openEyes

Async function openEyes will create a test. Actually, it will create a series of test, one for each browser configuration defined in the browser property of the configuraion.

• openEyes accepts a configuration object that will override the default configuration found by makeVisualGridClient, per this test.

• Returns a promise to an object with the following functions:

• checkWindow(...): creates a "step" that checks the window according to the baseline. Note that this function will not fail, and you need to call waitForTestResults to wait for the failure or success of a batch of steps in the test.

• close(): async closes the test (or series of tests) created by openEyes.

• abort(): if you want to abort this test (or series of tests). Async.

checkWindow(...)

checkWindow receives an object with the following parameters:

• tag: the name of the step, as seen in Applitools Eyes.
• url: the URL appearing in the address bar of the browser. All relative URLs in the CDT will be relative to it.
• cdt: the HTML and set and resources, in the x-applitools-html/cdt format (see below). you can use domNodesToCdt to create a CDT from a document.
• sizeMode: the target of the rendering. Can be one of viewport, full-page, selector, region
• selector: if the sizeMode is selector, this is the selector we are targetting.
• region: if the sizeMode is region, this is the region we are targetting. This is an object with x, y, width, height properties.
• ignore: TBD
• domCapture: ???
• scriptHooks: a set of scripts to be run by the browser during the rendering. An object with the following properties:
  • beforeCaptureScreenshot: a script that runs after the page is loaded but before taking the screenshot.
• resourceUrls?: By default, an empty array. Additional resource URLs not found in the CDT.
• resourceContents: a map of all resource values (buffers). The keys are URLs (relative to the url property). The value is an object with the following properties:
  • url: again???
  • type: the content type of the resource.
  • value: a Buffer of the resource content.

close()

close receives no parameters, and returns a promise.

• The promise will be resolved (with undefined as value) if all tests defined in the openEyes passed.
• The promise will be rejected (with DiffsFoundError as defined in Applitools Eyes SDK Core) if there were differences found in some tests defined in the openEyes.

The CDT format

{
  domNodes: [
    {
      nodeType: number, // like in the DOM Standard
      nodeName: ‘...’ , // for elements and DocumentType
      nodeValue: ‘...’, // for text nodes
      attributes: [{name, value}, ...],
      childNodeIndexes: [index, index, ...]
    },
    //...
  ],
  resources: [
    {
      hashFormat: 'sha256', // currently the only hash format allowed
      hash: '....', // the hash of the resource.
      contentType: '...', // the mime type of the resource.
    },
    //...
  ]
}

domNodesToCdt

Accepts a document object conforming to the DOM specification (browser document is fine, as is the JSDOM document). Returns a cdt, ready to be passed to checkWindow

Configuration

• See Eyes Cypress configuration for a list of properties in the configuration and to understand how the visual grid client reads the configuration.

Logging

???

Example

Example Mocha test that uses the visual grid client:

const path = require('path')
const fs = require('fs')
const {makeVisualGridClient, initConfig} = require('@applitools/visual-grid-client')
const domNodesToCdt = require('@applitools/visual-grid-client/src/browser-util/domNodesToCdt')
const {JSDOM} = require('jsdom')

describe('visual-grid-client test', function() {
  let visualGridClient
  let closePromises = []

  before(() => {
    visualGridClient = makeVisualGridClient({
      ...initConfig(),
      showLogs: true,
      renderStatusTimeout: 60000,
      renderStatusInterval: 1000,
    })
  })

  after(() => visualGridClient.waitForTestResults(closePromises))

  let checkWindow, close
  beforeEach(async () => {
    ;({checkWindow, close} = await visualGridClient.openEyes({
      appName: 'visual grid client with a cat',
      testName: 'visual-grid-client test',
    }))
  })
  afterEach(() => closePromises.push(close()))

  it('should work', async () => {
    checkWindow({
      tag: 'first test',
      url: 'http://localhost/index.html',
      cdt: domNodesToCdt(
        new JSDOM(fs.readFileSync(path.join(__dirname, 'resources/index.html'), 'utf-8')).window
          .document,
      ),
      sizeMode: 'viewport',
      resourceContents: {
        'cat.jpeg': {
          url: 'cat.jpeg',
          type: 'image/jpeg',
          value: fs.readFileSync(path.join(__dirname, 'resources/cat.jpeg')),
        },
      },
    })
  })
})