ruby-on-rails - 使用期望语法对权威人士进行 RSpec 测试

Question

我正在尝试将以下规范转换为新的期望语法，有人可以帮忙吗？

describe PostPolicy do
  subject { PostPolicy }

  permissions :create? do
    it "denies access if post is published" do
      should_not permit(User.new(:admin => false), Post.new(:published => true))
    end

    it "grants access if post is published and user is an admin" do
      should permit(User.new(:admin => true), Post.new(:published => true))
    end

    it "grants access if post is unpublished" do
      should permit(User.new(:admin => false), Post.new(:published => false))
    end
  end
end

我试过了，但它没有用，因为permit()返回了一个匹配器—— RSpec::Matchers::DSL::Matcher：

specify { expect(permit(@user, @post)).to be_true }

Answer 1

您必须subject显式调用 ，因为隐式接收器仅适用于should. 更多信息在这里和这里。

在您的示例中，这应该有效：

describe PostPolicy do
  subject { PostPolicy }

  permissions :create? do
    it "denies access if post is published" do
      expect(subject).not_to permit(User.new(:admin => false), Post.new(:published => true))
    end

    it "grants access if post is published and user is an admin" do
      expect(subject).not_to permit(User.new(:admin => true), Post.new(:published => true))
    end

    it "grants access if post is unpublished" do
      expect(subject).not_to permit(User.new(:admin => false), Post.new(:published => false))
    end
  end
end

Answer 2

另一种选择是使用隐式主题语法。

describe PostPolicy do
  subject { PostPolicy }

  permission :create? do
    it { is_expected.not_to permit(User.new(admin: false), Post.new(published: true)) }
  end
end

is_expected简单地调用expect(subject). 它使一个衬里更方便一些。