Complex code smell?

gistfile1.rb

describe 'Created Node Class' do
    before(:all) do
      @name = 'Patient'
      @token = {model_name: @name, properties: [:first, :second]}
      @klass = NodeFactory.get_node_class(@token)
    end
    

    
    it 'queries the graph and instantiates itself the correct number of times' do
      @@obj = 0
      @klass.class_eval do
        old_initialize = instance_method :initialize
        define_method :initialize do |*args, &block|
          result = old_initialize.bind(self).call(*args, &block)
          @@obj += 1
          result
        end
      end
      
      these_objects = Random.new.rand(10...20)
      these_objects.times.map.with_index do |_,index|
        Neo4j::Node.create({name: "name_#{index}"}, @name.to_sym)
      end
      Neo4j::Node.create({name: 'other'}, ':Not_Patient')
      @klass.instantiate_from_graph
      expect(@@obj).to eq(these_objects)
    end
    

end

gistfile2.rb

module Mgdb
  class CleanRoom
    instance_methods.each do |m|
      undef_method m unless m.to_s =~ /methods|object_id|method_missing|respond_to?|^__/
    end
  end
  
  class NodeFactory
    def self._node_class(klass)
      @node_class ||= Kernel.const_set(klass, Class.new(Neo4j::Node))
    end
    private_class_method :_node_class
    
    def self.get_node_class(args)
      klass_name = args.fetch(:model_name)
      properties = args.fetch(:properties)
      klass = _node_class klass_name
      klass.class_eval do
        extend Mgdb::Cypher
        extend Mgdb::ObjectSpaceHelpers
        properties.each do |prop|
          define_method prop.intern do
            instance_variable_get("@#{prop}")
          end
          define_method "#{prop}=".intern do |value|
            instance_variable_set("@#{prop}", value)
          end
        end
      end
      @node_class
    end
  end
  
  module Cypher
    def instantiate_from_graph
      klass_name = self.name.rpartition(':').last # Removes Kernel::
      nodes = Neo4j::Label.find_all_nodes(klass_name)
      nodes.each.map {self.new}
    end
  end

  module ObjectSpaceHelpers
    def obj_count
      ObjectSpace.each_object(self).count
    end
  end
  
end