grunt-phantomcss

Automate CSS regression testing with PhantomCSS

Getting Started

This plugin requires Grunt ~0.4.1

If you haven't used Grunt before, be sure to check out the Getting Started guide, as it explains how to create a Gruntfile as well as install and use Grunt plugins. Once you're familiar with that process, you may install this plugin with this command:

npm install grunt-phantomcss --save-dev

Once the plugin has been installed, it may be enabled inside your Gruntfile with this line of JavaScript:

grunt.loadNpmTasks('grunt-phantomcss');

The "phantomcss" task

Overview

In your project's Gruntfile, add a section named phantomcss to the data object passed into grunt.initConfig().

grunt.initConfig({
  phantomcss: {
    options: {},
    your_target: {
      options: {
        screenshots: 'test/visual/screenshots/',
        results: 'results/visual/'
      },
      src: [
        'test/visual/**/*.js'
      ]
    }
  }
});

Options

src

Type: String|Array

The test files to run.

options.screenshots

Type: String
Default: './screenshots'

The screenshots directory where test fixtures (comparison screenshots) are stored. Baseline screenshots will be stored here on the first run if they're not present.

options.results

Type: String
Default: './results'

The directory to store source, diff, and failure screenshots after tests.

options.viewportSize

Type: Array
Default: [1280, 800]

The viewport size to test the site in [width, height] format. Useful when testing responsive layouts.

options.logLevel

Type: String
Default: error

The CasperJS log level. See CasperJS: Logging for details.

Usage Examples

Basic visual tests

Run tests in test/visual/ against comparison screenshots stored in test/visual/screenshots/, and put the resulting screenshots in results/visual/

grunt.initConfig({
  phantomcss: {
    options: {
      screenshots: 'test/visual/screenshots/',
      results: 'results/visual/'
    },
    src: [
      'test/visual/**/*.js'
    ]
  }
});

Responsive layout testing

Run tests in test/visual/ against comparison screenshots for destop and mobile.

grunt.initConfig({
  phantomcss: {
    desktop: {
      options: {
        screenshots: 'test/visual/desktop/',
        results: 'results/visual/desktop',
        viewportSize: [1024, 768]
      },
      src: [
        'test/visual/**.js'
      ]
    },
    mobile: {
      options: {
        screenshots: 'test/visual/mobile/',
        results: 'results/visual/mobile',
        viewportSize: [320, 480]
      },
      src: [
        'test/visual/**.js'
      ]
    }
  },
});

Sample test file

Test files should do the following:

Start CasperJS with the URL you want to test
Manipulate the page in some way
Take screenshots

casper.start('http://localhost:3000/')
.then(function() {
  phantomcss.screenshot('#todo-app', 'Main app');
})
.then(function() {
  casper.fill('form.todo-form', {
    todo: 'Item1'
  }, true);

  phantomcss.screenshot('#todo-app', 'Item added');
})
.then(function() {
  casper.click('.todo-done');

  phantomcss.screenshot('#todo-app', 'Item checked off');
});

You can also load a local file by specifying a path (relative to the Gruntfile):

casper.start('build/client/index.html')
.then(function() {
  // ...
});

See the CasperJS documentation and the PhantomCSS documentation for more information on using CasperJS and PhantomCSS.

Contributing

In lieu of a formal styleguide, take care to maintain the existing coding style. Add unit tests for any new or changed functionality. Lint and test your code using Grunt.

Release History

2014-01-07 v0.2.0 Merged updates from Larry Davis
2013-10-24 v0.1.1 Added the ability to use an external server
2013-10-24 v0.1.0 Initial Release

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