instance method tests

# File actioncable/lib/action_cable/connection/test_case.rb, line 256
          def tests(connection)
            case connection
            when String, Symbol
              self._connection_class = connection.to_s.camelize.constantize
            when Module
              self._connection_class = connection
            else
              raise NonInferrableConnectionError.new(connection)
            end
          end