mocha-phantomjs-core

Run Mocha tests in PhantomJS

So now that you got your tests Mocha running on a simple flat HTML file, now how do you run them in your CI environment? Karma? what is this karma.conf.js file I have to write? and some background runner task? how do I grep over just a few tests? wait I need a to also install a driver for phantomjs too? bleck.

Rather than force you to redo your test harness and local development testing, simply run phantomjs mocha-phantomjs-core.js spec tests/mytests.html and be done with it. mocha-phantomjs-core builds on top of what you already have, with no high barrier to entry like Karma.

The core of mocha-phantomjs

This project is the core phantomjs code for mocha-phantomjs. If you are a regular user wanting to use it from the command line, you'll want to go there. If you are a build plugin author, or want direct control over how phantomjs is invoked, you are in the right place.

Installation

npm install mocha-phantomjs-core

Usage

phantomjs mocha-phantomjs-core.js <TESTS> <REPORTER> <CONFIG as JSON>

Due to resource loading timing issues with external sources, you may need to call initMochaPhantomJS before calling any mocha setup functions like setup(), ui(), etc. mocha-phantomjs-core will notify you if you need this, and if so, add a check for it before your mocha setup code:

if (typeof initMochaPhantomJS === 'function') {
  initMochaPhantomJS()
}

This can be avoided by removing unnessecary external resources like fonts, CSS, etc. from your tests, or simply having mocha.js as the first script loaded.

Config

It's best to always refer to the tests for full usage and examples.

reporter

One of mocha's built in reporters, or a full path to a file for a 3rd party reporter (see below on how to write one).

grep

a string to pass to mocha.grep() to filter tests. also provide invert: true if you want to invert the grep and filter out tests.

useColors

Boolean. Force or suppress color usage. Defaults to what your terminal supports.

bail

Boolean. Stop the test run at the first failure if true. Defaults to false.

ignoreResourceErrors

Boolean. Suppress the resource failure output that mocha-phantomjs-core will output by default.

timeout

Time in milliseconds after the page loads that mocha.run needs to be called. Defaults to 10 seconds.

viewportSize

Sets the viewport size. Specify height and width, like below:

settings

If you need to pass additional settings to the phantomjs webpage, you can specify an object of settings here, including common ones like userAgent and loadImages.

phantomjs mocha-phantomjs-core.js dot tests/mytests.html "{\"viewportSize\":{\"width\":720,\"height\":480}}"

Previously mocha-phantomjs required you to look for mochaPhantomJS and then use mochaPhantomJS.run(). That is no longer required. Call mocha.run() as you normally would.

Screenshots

mocha-phantomjs-core supports creating screenshots from your test code. For example, you could write a function like below into your test code.

function takeScreenshot() {
  if (window.callPhantom) {
    var date = new Date()
    var filename = "screenshots/" + date.getTime()
    console.log("Taking screenshot " + filename)
    callPhantom({'screenshot': filename})
  }
}

If you want to generate a screenshot for each test failure you could add the following into your test code.

  afterEach(function () {
    if (this.currentTest.state == 'failed') {
      takeScreenshot()
    }
  })

Environment variables

mocha-phantomjs-core will expose environment variables at mocha.env

Third Party Reporters

Mocha has support for custom 3rd party reporters, and mocha-phantomjs does support 3rd party reporters, but keep in mind - the reporter does not run in Node.js, but in the browser, and node modules can't be required. You need to only use basic, vanilla JavaScript when using third party reporters. However, some things are available:

• require: You can only require other reporters, like require('./base') to build off of the BaseReporter
• exports, module: Export your reporter class as normal
• process: use process.stdout.write preferrably to support the --file option over console.log (see #114)

Also, no compilers are supported currently, so please provide plain ECMAScript 5 for your reporters.

Testing

npm install
npm test

Travis CI does a matrix build against phantomjs 1.9.7 and 2.0.0, currently. See .travis.yml for the latest.

To debug an individual test, since they are just process forks, you may want to run them directly, like

phantomjs mocha-phantomjs-core.js test/timeout.html spec "{\"timeout\":500}"

License

Released under the MIT license. Copyright (c) 2015 Ken Collins and Nathan Black.