通过与 minitest 进行集成测试，无法访问数据库答案

【问题标题】：Can't hit the DB, by integration testing with minitest通过与 minitest 进行集成测试，无法访问数据库
【发布时间】：2016-03-07 10:31:52
【问题描述】：

我一直在测试 F

“User.count”没有改变 1。

即使我不应该（因为 SessionsController#create 确实已经工作了）。

测试代码是这样的：

- [重构/更新] - 我还放弃了模型中的所有验证，只是为了看看……但什么也没有

class UsersSignupTest < ActionDispatch::IntegrationTest

  test "valid signup information" do   

    OmniAuth.config.test_mode = false

    get signup_path
    assert_difference 'User.count', 1 do
      get '/auth/identity/register', params: {
        user: { name: "Example User",
                email: "user@example.com",
                password_digest: "password",
                identities: { user_id: 1, 
                              provider: "identity", 
                              uid: "1"}}}
    end

    OmniAuth.config.test_mode = true
  end
end

完整输出：

UsersSignupTest#test_valid_signup_information = 0.69 s = F


Failure:
UsersSignupTest#test_valid_signup_information [/home/lsoave/rails5/gitwatcher/test/integration/users_signup_test.rb:19]:
"User.count" didn't change by 1.
Expected: 5
  Actual: 4

tail -f log/test.log 我得到以下信息：

----------------------------------------------
UsersSignupTest: test_valid_signup_information
----------------------------------------------
Started GET "/signup" for 127.0.0.1 at 2016-03-07 15:17:16 +0100
Processing by UsersController#new as HTML
  Rendered users/new.html.erb within layouts/application (37.7ms)
  User Load (0.3ms)  SELECT  "users".* FROM "users" WHERE "users"."id" IS NULL LIMIT $1  [["LIMIT", 1]]
  Rendered layouts/_navigation.html.erb (3.6ms)
  Rendered layouts/_signup-modal.html.erb (2.6ms)
  Rendered layouts/_messages.html.erb (0.4ms)
  Rendered layouts/_footer.html.erb (0.2ms)
Completed 200 OK in 265ms (Views: 250.3ms | ActiveRecord: 0.6ms)
   (0.4ms)  SELECT COUNT(*) FROM "users"
Started GET "/auth/identity/register?user[name]=Example+User&user[email]=user%40example.com&user[password_digest]=[FILTERED]&user[identities][user_id]=1&user[identities][provider]=identity&user[identities][uid]=1" for 127.0.0.1 at 2016-03-07 15:17:16 +0100
   (0.3ms)  SELECT COUNT(*) FROM "users"
   (0.2ms)  ROLLBACK

更新说明：

真正的模型是 User has_many identities / Identity belongs_to user 关系，我不确定它是否正确表示：

...
params: {
            user: { name: "Example User",
                    email: "user@example.com",
                    password_digest: "password",
                    identities: { user_id: 1, 
                                  provider: "identity", 
                                  uid: "1"}}}
...

【问题讨论】：

可能您的用户模型的验证之一没有通过。
@gabrielef 我也放弃了模型中的所有验证，只是为了看看......但什么也没有

标签： ruby-on-rails testing integration-testing omniauth minitest

【解决方案1】：

尝试将 identities:piece 替换为以下内容：

identities_attributes: { '0': {provider: "identity", uid: "1"}}

并检查您的用户模型包含：

accepts_nested_attributes_for :identities

无需自己为依赖模型分配 user_id，这是 Rails 擅长的。

【讨论】：