我能在我的RSPEC测试中实现依赖注入吗?

有趣的问题。

你可以用一个封装的例子来做,但是还有另一个更清晰的方法:

分开 shared_example s表示阳性和阴性。你做的是阴性的,所以你很好(只需改变名字,让它清楚地表明这是一组阴性测试)。

正面的可以是这样的:

RSpec.shared_examples 'restricted action with logged in user' do
  before { login(authorized_user) }

  specify do
    expect_stuff_typical_for_logged_in_user
    # e.g. expect(response).to be_success
  end
end

然后在你的规格中包括 include_examples ,就像这样

context do 
  include_examples 'restricted action with logged in user'
  # you're "inside" the context of included examples so you can 
  # write down extra expectations specific for each action
end

可能有一种情况是,你的积极部分没有共同的期望,只是建立背景-你可以考虑使用 shared_context 清楚地传达你的意图。

您可以将所有这些限制在一个共享示例中,如下所示:

RSpec.shared_examples "action requiring proper user logged in to be successful" do
  # set up the context for positive scenarios, so you can include it with 
  # `include_examples` and be "inside" this context
  before { login(authorized_user) }

  context "- when the logged in user is not the required logged user" do
    before(:each) do
      login(incidental_user)
    end
    it_behaves_like "unsuccessful attempt to change the reservation"
  end
  context "- when there's no user logged in" do
    before { log_out_people }
    it_behaves_like "unsuccessful attempt to change the reservation"
  end
end

这有两个问题。首先,你建立了一个积极的背景,然后你必须在消极的例子中撤销它(感觉 smelly ) 其次,规范中发生的事情可能并不明显。 它们看起来像这样:

context do
  include_examples 'action requiring proper user logged in to be successful'

  specify do
    expect(response).not_to be_redirect
  end

  context 'when user have not seen changes TOS' do
    before { }
    specify do
      expect(session[:notice]).to eq 'Please read new TOS'
    end
end 

而且还不清楚的是,负面的例子已经被覆盖了。

然后,如果在任何地方,您需要对 消极的 不管怎样,你还是需要把它们分开。

你可以决定走哪条路,注意权衡。

最后我用lambda解决了我的问题:

RSpec.shared_examples "changing status" do |arguments|
  /* ... */

  it_behaves_like "action requiring proper user logged in to be successful", action, -> {
    before(:each) do
      /* ... */
    end
    context "and when the reservation has an allowed status" do
      /* ... */
    end
    context "and when the reservation has a not allowed status" do
      /* ... */
    end
  }
end
RSpec.shared_examples "action requiring proper user logged in to be successful" do |action, successful_behavior|
  context "- when the required logged user is logged in" do
    successful_behavior.()
  end
  context "- when the logged in user is not the required logged user" do
    before(:each) do
      login(incidental_user)
    end
    it_behaves_like "unsuccessful attempt to change the reservation", action
  end
  context "- when there's no user logged in" do
    it_behaves_like "unsuccessful attempt to change the reservation", action
  end
end