用 let 重构 rspec

Question

我正在关注 Michael Hartl 的 Ruby on Rails 教程。 如何使用let 重构下面的代码而不是使用实例变量？

describe User do    

  before do
    @user = User.new(name: "Example User", email: "user@example.com")
  end    

  subject { @user }    

  it { should respond_to(:name) }
  it { should respond_to(:email) }    

  it { should be_valid }    

  describe "when name is not present" do
    before { @user.name = " " }
    it { should_not be_valid }
  end
end

我尝试自己重构代码但失败了。

describe User do
  let(:user) { User.new(name: "Example User", email:"foo@example.com") }    

  subject { user }    

  it { should respond_to(:name) }
  it { should respond_to(:email) }  

  it { should be_valid }    

  describe "when name is not present" do
    # ???
    let(:name) { " " } 
    it { should_not be_valid }
  end
end

Answer 1

对于“当名称不存在”示例组，这就足够了：

describe "when name is not present" do
  before { subject.name = '' }
  it { should_not be_valid }
end

从您单独发布的代码来看，将:name 设置为let() 没有任何附加价值。