reproduction.rb

class LazilyDefineAttributes < Module
  def initialize(attribute_definition)
    define_method(:method_missing) do |method_name, *args, &block|
      attribute_defintion
    end
  end
end

class Foo
end

Foo.include(LazilyDefineAttributes.new(:foo))

require "minitest/autorun"
class TestStuff < Minitest::Test
  def test_stuff
    Foo.new.asdfasdkfj
  end
end