如何获取RSpec当前的上下文名称？

如果我有这样的 rspec

describe 'Foo' do
 # init go here
 describe 'Sub-Foo' do
    it "should Bar" do
       # test go here
       # puts ... <-- need "Foo.Sub-Foo should Bar" here 
    end
 end
end

如何在 // test go here 的测试上下文中获取“Foo.Sub-Foo should Bar”？

它与specdocs 的格式类似，但如何将其放入自身内部？

RSpec.describe 'Foo' do
  describe 'Sub-Foo' do
    # NOTE: `self.` context is also available within subject { } block

    it 'should Bar' do |example|
      expect(self.class.description).to eq('Sub-Foo')
      expect(example.description).to eq('should Bar')

      expect(self.class.top_level_description).to eq('Foo')
    end
  end
end