ruby-on-rails - 在嵌套 Rspec 上下文中继承示例

Question

如何重用示例，以便只覆盖嵌套上下文的细节？

类似这样的事情(我使用 thee 而不是它，这表明它是在嵌套上下文中执行的。它不在 RSpec 中，正是我想要的):

describe "Abilities" do
  subject { Abilities.new user }

  context "allowed" do
    let(:user) { Factory(:power_user) }
    thee { should be_able_to :create, object }
    thee { should be_able_to :read, object }
    thee { should be_able_to :update, object }

    context "comment" do
      let(:object) { Factory(:comment) }
    end

    context "post" do
      let(:object) { Factory(:post) }
    end

    context "blog" do
      let(:object) { Factory(:blog) }
    end

  end
end

此示例最终会针对 3 个上下文(评论、帖子、博客)生成 3 个示例(创建、阅读、更新)，从而导致总共 9 个示例。

如何实现它(不编写共享示例)？

Answer 1

没有办法继承例子，但你可以创建一个类方法:

describe "Abilities" do
  subject { Abilities.new user }

  def self.should_allow_stuff
    it { should be_able_to :create, object }
    it { should be_able_to :read, object }
    it { should be_able_to :update, object }
  end

  context "allowed" do
    let(:user) { Factory(:power_user) }

    context "comment" do
      let(:object) { Factory(:comment) }
      should_allow_stuff
    end

    context "post" do
      let(:object) { Factory(:post) }
      should_allow_stuff
    end

    context "blog" do
      let(:object) { Factory(:blog) }
      should_allow_stuff
    end

  end
end

如果需要，您可以根据需要进行重构。