Using Knapsack Pro in Queue Mode with puffing-billy

caution

This is needed only if you are using Knapsack Pro in Queue Mode.

If you use the puffing-billy gem and encounter the crash described in this Github issue, apply the following patch:

# rails_helper.rb or spec_helper.rb

# A patch to `puffing-billy`'s proxy so that it doesn't try to stop eventmachine's reactor if it's not running.
module BillyProxyPatch
  def stop
    return unless EM.reactor_running?
    super
  end
end
Billy::Proxy.prepend(BillyProxyPatch)

# A patch to `puffing-billy` to start EM if it has been stopped.
Billy.module_eval do
  def self.proxy
    if @billy_proxy.nil? || !(EventMachine.reactor_running? && EventMachine.reactor_thread.alive?)
      proxy = Billy::Proxy.new
      proxy.start
      @billy_proxy = proxy
    else
      @billy_proxy
    end
  end
end

if ENV["KNAPSACK_PRO_TEST_SUITE_TOKEN_RSPEC"]
  KnapsackPro::Hooks::Queue.before_queue do
    Billy.proxy.start
  end

  KnapsackPro::Hooks::Queue.after_queue do
    Billy.proxy.stop
  end
end

This problem is caused by how knapsack_pro in Queue Mode uses RSpec::Core::Runner.