$ rake spec AppScreenshots - should take screenshots AppScreenshots.menu - should be <= 5.0% difference AppScreenshots.timeline - should be <= 5.0% difference [FAILED - was 10.75%] Bacon::Error: was 10.75% spec.rb:698:in `satisfy:': AppScreenshots.timeline - should be <= 5.0% difference spec.rb:438:in `execute_block' spec.rb:402:in `run_postponed_block:' spec.rb:397:in `resume' 3 specifications (3 requirements), 1 failures, 0 errors
(calculated diffs are truer than visual representation)
Add this line to your application's Gemfile:
And then execute:
Or install it yourself as:
$ gem install motion-screenspecs
motion-screenspecs works in unison with motion-screenshots. Here are the steps you need to get everything working:
Create a subclass of
Motion::Screenshots::Base(see the motion-screenshots README).
Create the following directory structure:
spec/ screenshots/ [YourScreenshotSubclass] expectations/ [title of your screenshot].png [title of your other screenshot].png [etc].png
The images in
expectationsare known values for your app. You can take these screenshots manually or using motion-screenshots'
Failing image diffs will be saved in
spec/screenshots/[YourScreenshotSubclass]/failures. All results from the latest test are saved to
Add a call to
tests_screenshotsin your specs:
describe "Screenshots" do tests_screenshots AppScreenshots end
The sample app is a complete example with a failing test.
Hats off to Jeff Kreeftmeijer for the image diffing help!
There's a couple of configuration options you can use:
Motion::Project::App.setup do |app| # Set your tolerance % for image differences Motion::Screenspecs.set_tolerance(5.0, app) # Set how long the tests will wait for your screenshots to finish Motion::Screenspecs.set_screenshot_timeout(120, app) # Set how long the tests will wait for a given image to finish diffing Motion::Screenspecs.set_diff_timeout(20, app) # Set whether or not your failed diffs will open in Finder upon finishing tests Motion::Screenspecs.open_failures_at_exit = true end
- Fork it
- Create your feature branch (
git checkout -b my-new-feature)
- Commit your changes (
git commit -am 'Add some feature')
- Push to the branch (
git push origin my-new-feature)
- Create new Pull Request