class ActionCable::Channel::ConnectionStub

def initialize(identifiers = {})
  @transmissions = []
  identifiers.each do |identifier, val|
    define_singleton_method(identifier) { val }
  end
  @subscriptions = ActionCable::Connection::Subscriptions.new(self)
  @identifiers = identifiers.keys
  @logger = ActiveSupport::TaggedLogging.new ActiveSupport::Logger.new(StringIO.new)
end