Just my own testing of Ruby classes, objects and how they go together, inheritance, etc.

class-object-testing.rb

class AParent
  attr_reader :hello
end

class Outer
  attr_reader :inner
  
  def initialize( inner )
    @inner = inner
  end
  
  def lol
    'lulz'
  end
end

class Inner < AParent
  def hi
    'there'
  end
end

inner = Inner.new
outer = Outer.new inner