test method chain ruby

test-ruby-1.rb

module A
  def say
    p "in A"
  end
end

module B
  include A
  
  def say
    p "in B"
  end
end

module C
  def say
    p "in C"
  end
end

class E
  include A
  
  def say
    p "in E"
  end
end

class D < E 
  include B
  include C
  
  def say
    p "in D"
  end
end

D.new.say