Hello.
Sometimes it is nice to compare two images with one another. We find this particularly handy for testing browser screenshots.
With Symilaa, this is particularly easy.
- How to do it.
one = Symilaa::Image.new 'image.png'
two = Symilaa::Image.new 'slightly_different_image.png'
three = Symilaa::Image.new 'very_different_image.png'
one == one
#=> true
one == two
#=> false
one.similar_to? two
#=> true
one.similar_to? three
#=> falseThat's it. Have a nice life.
ComparisonSupport also provides a module for use with Cucumber testing.
Use ComparisonSupport#check_screen_against_reference_shot to take a screenshot of the current page under test
and compare it with an existing reference screenshot.
NOTE
You must include the following in your features/support/env.rb:
Before do |scenario|
@gherkin_statement = scenario.gherkin_statement.name if scenario.respond_to?('gherkin_statement')
@gherkin_statement = scenario.scenario_outline.gherkin_statement.name if scenario.respond_to?('scenario_outline')
end
FileUtils.rm_rf 'artifacts/screenshots_generated_this_run'