ruby-on-rails - rspec let，如何取消设置属性

Question

我有以下规范:

describe Country do

  let (:country) { Country.new(:country_code => "NL", :name => "Netherlands") }

  context "when country code is empty" do
  let (:country) { Country.new(:name => "Netherlands") }

    it "should not be valid" do
      expect(country.valid?).to be_falsey
    end
    it "should not save" do
      expect(country.save).to be_falsey
    end    
  end

  context "when country code is not empty" do
    let (:country) { Country.new(:country_code => "NL") }

    it "should be valid" do
      expect(country.valid?).to be_truthy
    end

    it "should save" do
      expect(country.save).to be_truthy
    end
  end

  context "when name is empty" do
    it "should not be valid" do
      expect(country.valid?).to be_falsey
    end

    it "should not save" do
      expect(country.save).to be_falsey
    end
  end


end


end

我想要实现的是在 let 方法中“取消设置”一个属性。理想情况下，我想:

let (:country) { country.country_code = nil }

我想这样做是因为我想测试 Country 的 SINGLE 属性是否存在(和不存在)，同时保持其他属性设置。

Answer 1

有很多方法可以做到这一点。

1. 您可以在每个上下文中使用#before:

   做之前
country.code = nil #在另一个上下文中将其更改为非空代码
结束

2. 或者，您可以更改顶级 let 以引用 country_code let，如下所示:

   let (:country) { Country.new(:country_code => country_code, :name => "Netherlands") }

   #immediately after context “when country code is empty”
let(:country_code) { nil }

   .....#immediately after: context "when country code is not empty"做
让 (:country_code) { "NL"}

   如果您的上下文“when name is empty需要country_code，则将顶级代码定义为默认值。

因此，您的代码可能如下所示:

  describe Country do

  let (:country) { Country.new(:country_code => country_code, :name => "Netherlands") }
  let(:country_code) { "NL" } #default

  context "when country code is empty" do
    let (:country_code) { nil } 

    it "should not be valid" do
      expect(country.valid?).to be_falsey
    end
    it "should not save" do
      expect(country.save).to be_falsey
    end    
  end

  context "when country code is not empty" do
    let (:country_code) {  "NL" }

    it "should be valid" do
      expect(country.valid?).to be_truthy
    end

    it "should save" do
      expect(country.save).to be_truthy
    end
  end

  context "when name is empty" do
    it "should not be valid" do
      expect(country.valid?).to be_falsey
    end

    it "should not save" do
      expect(country.save).to be_falsey
    end
  end


end


end