我有一个用户控制器,我想测试索引页面,我正在寻找michael hart'l的rails教程的一个例子,我复制它,这是测试(主要的是索引页面显示所有用户,测试用户是否为管理员,如果是,用户应该有一个“删除”链接,允许管理员销毁他们):
require 'spec_helper'
describe "user pages" do
subject { page }
describe "index" do
let(:user) { FactoryGirl.create(:user) }
before(:each) do
sign_in user
visit users_path
end
it { should have_title('Users') }
it { should have_content('Users') }
describe "delete links" do
it { should_not have_link("delete") }
describe "as an admin user" do
let(:admin) { FactoryGirl.create(:admin) }
before do
sign_in admin
visit users_path
end
it { should have_link("delete", href: user_path(User.first)) }
it "should be able to delete another user" do
expect do
click_link('delete', match: :first)
end.to change(User, :count).by(-1)
end
it { should_not have_link('delete', href: user_path(admin)) }
end
end
end
我的用户工厂定义如下:
FactoryGirl.define do
factory :user do
sequence(:name) { |n| "Person #{n}" }
sequence(:email) { |n| "person_#{n}@example.com"}
password "foobar"
password_confirmation "foobar"
factory :admin do
admin true
end
end
end
这里没有问题,所有测试也都在通过。但是当我评论或删除上述测试中的以下行时:
let(:user) { FactoryGirl.create(:user) }
before(:each) do
sign_in user
visit users_get_path
end
它给了我错误:
1) user pages index delete links as an admin user
Failure/Error: it { should have_link("delete", href: user_path(User.first)) }
expected #has_link?("delete", {:href=>"/users/2395"}) to return true, got false
# ./spec/requests/user_pages_spec.rb:40:in `block (5 levels) in <top (required)>'
2) user pages index delete links as an admin user should be able to delete another user
Failure/Error: click_link('delete', match: :first)
Capybara::ElementNotFound:
Unable to find link "delete"
# ./spec/requests/user_pages_spec.rb:43:in `block (6 levels) in <top (required)>'
# ./spec/requests/user_pages_spec.rb:42:in `block (5 levels) in <top (required)>'
我无法理解为什么它失败了,第一个前块和“删除链接”块中的其他例子之间的关系是什么?我只需要一个简单的解释,谢谢
答案 0 :(得分:2)
let
进行了延迟评估,并且在您的“删除链接”示例中未引用user
,因此如果没有第一个before
块,则不会创建常规用户并显示相应的删除链接不存在,导致测试失败。将初始let
更改为let!
可以避免此问题。