Forcing Experiment Results for Cucumber tests

You can force the chosen option of an experiment in Cucumber by creating an ab_test_steps.rb containing the following:

Before do
  e = Vanity.playground.experiment(:experiment_name)
  e.identify { |controller| 1 }
  e.chooses(:value)
end

This forces the experiment to always use the same identity, and then sets the chosen value for that identity, thus making sure that the results are always consistent.