Rails 3 RSpec和assert_select

Question

我曾想过尝试使用Rspec.但我得到了assert_select的下一个问题.

1) UserController login page open login page contains all expected controls
Failure/Error: assert_select "form[action=?]", "/user/login" do MiniTest::Assertion:
Expected at least 1 element matching "form[action='/user/login']", found 0.
# (eval):2:in `assert'
# ./spec/controllers/user_controller_spec.rb:20:in `block (3 levels) in <top (required)>'

这是我的代码片段

describe UserController do
  describe "login page open" do
    it "login page contains all expected controls" do
      get :login
      assert_select "form[action=?]", "/user/login" do
      assert_select "input[name=?]", "username"
      assert_select "input[name=?]", "password"
      assert_select "input[type=?]", "submit"
    end
  end
end

当我在浏览器中打开登录页面时,此页面打开没有问题.

Answer 1

默认情况下,RSpec(至少在较新版本中)阻止Rails在运行控制器规范规范时呈现视图.他们希望您在视图规格中测试您的视图,而不是控制器规格.由于视图不呈现,因此assert_select总是失败.

但是对于那些(像我一样)希望在控制器规范中测试偶尔的视图片段的人来说,他们提供了一种render_views方法.你必须在你的describe或context块中调用它,而不是在it块内.

describe UserController do

  render_views       # <== ADD THIS

  describe "login page open" do
    it "login page contains all expected controls" do
      get :login
      assert_select "form[action=?]", "/user/login" do
      assert_select "input[name=?]", "username"
      assert_select "input[name=?]", "password"
      assert_select "input[type=?]", "submit"
    end
  end
end