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selenecss

CSS regression testing in SeleniumWebdriver. This plugin is an automatic visual regression-testing tool for Selenium Webdriver and Selene. It was inspired by Christian Bromann's awesome project called WebdriverCSS. After initialization it enhances a Webdriver instance with an additional command called selenecss and enables the possibility to save screenshots of your application.

How does it work?

  1. Define areas within your application that should always look the same
  2. Use a Selenium Webdriver instance and SeleneCSS to write some E2E tests and take screenshots of these areas
  3. Continue working on your application or website
  4. After a while rerun the tests
  5. If desired areas differ from previous taken screenshots an image diff gets generated and you get notified in your tests

Setup

To use this plugin just call the init function and pass the desired Webdriver instance as parameter. Additionally you can define some options to configure the plugin. After that the selenecss command will be available only for this instance.

  • screenshotRoot String ( default: ./selenecss )
    path where all screenshots get saved.

  • failedComparisonsRoot String ( default: ./selenecss/diff )
    path where all screenshot diffs get saved.

  • misMatchTolerance Number ( default: 0.05 )
    number between 0 and 100 that defines the degree of mismatch to consider two images as identical, increasing this value will decrease test coverage.

  • screenWidth Numbers[] ( default: [] )
    if set, all screenshots will be taken in different screen widths (e.g. for responsive design tests)

  • updateBaseline Boolean ( default: false )
    updates baseline images if comparison keeps failing.