Module: Gitlab::Experiment::RSpecHelpers

Defined in:
lib/gitlab/experiment/rspec.rb

Instance Method Summary collapse

Instance Method Details

#stub_experiments(experiments, times = nil) ⇒ Object 



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# File 'lib/gitlab/experiment/rspec.rb', line 6

def stub_experiments(experiments, times = nil)
  experiments.each { |experiment| wrapped_experiment(experiment, times) }
end

#wrapped_experiment(experiment, times = nil, expected = false, &block) ⇒ Object 



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# File 'lib/gitlab/experiment/rspec.rb', line 10

def wrapped_experiment(experiment, times = nil, expected = false, &block)
  klass, experiment_name, variant_name = *experiment_details(experiment)
  base_klass = Configuration.base_class.constantize

  # Set expectations on experiment classes so we can and_wrap_original with more specific args
  experiment_klasses = base_klass.descendants.reject { |k| k == klass }
  experiment_klasses.push(base_klass).each do |k|
    allow(k).to receive(:new).and_call_original
  end

  receiver = receive(:new)

  # Be specific for BaseClass calls
  receiver = receiver.with(experiment_name, any_args) if experiment_name && klass == base_klass

  receiver.exactly(times).times if times

  # Set expectations on experiment class of interest
  allow_or_expect_klass = expected ? expect(klass) : allow(klass)
  allow_or_expect_klass.to receiver.and_wrap_original do |method, *original_args, &original_block|
    method.call(*original_args).tap do |e|
      # Stub internal methods before calling the original_block
      allow(e).to receive(:enabled?).and_return(true)

      if variant_name == true # passing true allows the rollout to do its job
        allow(e).to receive(:experiment_group?).and_return(true)
      else
        allow(e).to receive(:resolve_variant_name).and_return(variant_name.to_s)
      end

      # Stub/set expectations before calling the original_block
      yield e if block

      original_block.call(e) if original_block.present?
    end
  end
end