Difficulties accessing an anonymous class' name in its superclass' self.inherited

anonymous_class_name.rb

require 'minitest/autorun'

class BaseBuilder
  class << self
    attr_accessor :klass
  end

  def self.inherited(subclass)
    super
    subclass.klass = (subclass.name || subclass.to_s).gsub(/Builder\z/, '')
  end
end

class ObjectBuilder < BaseBuilder
end

describe 'Accesses the class name in self.inherited' do

  it 'cuts off "Builder" and returns "Object"' do
    ObjectBuilder.name.wont_be_nil
    ObjectBuilder.klass.must_equal 'Object'
  end

  it 'has problems with anonymous classes' do
    Class.new(BaseBuilder) do
      def self.to_s
        'FooBuilder'
      end
    end.klass.must_equal 'Foo'
  end

  it 'does not have a name either' do
    StringBuilder = Class.new(BaseBuilder)
    StringBuilder.klass.must_equal 'String'
  end

end