instance method tests

# File actioncable/lib/action_cable/channel/test_case.rb, line 151
          def tests(channel)
            case channel
            when String, Symbol
              self._channel_class = channel.to_s.camelize.constantize
            when Module
              self._channel_class = channel
            else
              raise NonInferrableChannelError.new(channel)
            end
          end