Module - Attester documentation


attester can work in two ways:

  • from the command line. This is the simplest way to run a single test campaign inside a build and validate its result
  • as a module. This gives the highest degree of configuration and extensibility

Please note that attester can be used as a module only starting from version 1.2.2

Using attester as a module means installing it alongside with your project instead of globally

npm install attester --save-dev

This will install attester and save a devDependency in your package.json

Once installed you'll have to create your own script using attester to start campaigns.

The base skeleton for such a script is

var attester = require("attester");

// Called when the campaign completes successfully
attester.event.once("attester.core.idle", function () {
    console.log("Test OK");

// Called when the campaign fails
attester.event.once("", function () {
    console.log("Some tests fails, please check the logs");

// Create a campaign with a given configuration
    resources: {
        "/" : ["src"]
    tests: {
        mocha: {
            files: {
                includes: ["test/**/*.js"]



attester works on top of the standard node module system, so it can be required with

var attester = require("attester");

This object is then made of smaller submodules that communicate through messages.

Core modules are

  • campaign Create and manage test campaigns.
  • config Handle global configuration
  • core Main module, coordinates all the others
  • event Event communication bus
  • launcher Launch and drive browsers
  • logger Provide a logging interface
  • reports Write test reports
  • server Start and control the test server

For a generic usage, the most interesting events are

  • launcher.connect Raised when the test server is ready and the campaign was initialized. After these event it's possible to connect browser, either local or remote.
  • attester.core.idle Raised when the all campaigns end successfully.
  • Raised when all campaigns end, and at least one is in error.

While the most common methods are

  • attester.event.on() and attester.event.once() To register to events.
  • attester.config.set() To set configuration options.
  • attester.config.readFile() To read a configuration file from disk.
  • attester.campaign.create() To create a new test campaign.
  • attester.start() alias of attester.core.start() To start executing campaigns.