MyTracer

my_tracer.rb

class MyTracer < BasicObject
    def initialize(obj)
      @original_obj = obj
    end

    def method_missing(method, *args, **kw_args, &block)
      if @original_obj.respond_to?(method)
        ::Kernel.puts "Method Missing: #{method} | #{args.inspect} | #{kw_args.inspect}"
        @original_obj.send(method, *args, **kw_args, &block)
      else
        super
      end
    end

    def respond_to_missing?(method, include_private = false)
      (@original_obj.respond_to?(method, include_private) || super).tap do |value|
        ::Kernel.puts "Asked if responds to method #{method} and responded with: #{value}"
      end
    end
  end