使用 testify 检查结构中字段的动态值

Question

我有一个 user service 来验证用户数据并对其进行格式化，然后调用创建 firebase 用户和 return firebase id 的 Firebase 服务，然后将该用户数据传递给 repository层。我的用户结构有一个 ID 字段，在传递到 repository 层之前由 user service 中的 uuid 填充。我正在使用 strecher/testify 模拟 firebase 服务和存储库层。但是测试失败了，因为 ID 由服务层填充，我无法将 ID 传递给模拟函数使用的用户数据。

user := model.User{
        ID:         "",
        FirebaseID: "",
        FirstName: "Test",
        LastName:  "User",
        FullName:  "Test User",
        Email:     "testuser@email.com"
        Password: "password",
    }

服务层代码

func (u userService) CreateUser(user model.User) error {
  err := validateFields(user)
  if err != nil {
      return fmt.Errorf("userService CreateUser: %w", err)
  }

  user.FullName = user.FirstName + " " + user.LastName
  user.FirebaseID, err = u.authClient.CreateUser(user)
  if err != nil {
      return fmt.Errorf("userService CreateUser: %w", err)
  }

  user.ID = uuid.NewString()
  err = u.userRepo.CreateUser(user)
  if err != nil {
      return fmt.Errorf("userService CreateUser: %w", err)
  }

return nil

}

测试代码

func TestCreateUser(t *testing.T) {
  mockFirebaseAuthClient := new(MockFirebaseAuthClient)
  mockPostgresRepo := new(MockPostgresRepo)
  userService := NewUserService(mockPostgresRepo, mockFirebaseAuthClient)

  t.Run("Valid data", func(t *testing.T) {
      user := model.User{
        ID:         "",
        FirebaseID: "firebaseuniqueid",
        FirstName: "Test",
        LastName:  "User",
        FullName:  "Test User",
        Email:     "testuser@email.com",
        Password: "password",
      }
      mockFirebaseAuthClient.On("CreateUser", user).Return("firebaseuniqueid", nil)
      mockPostgresRepo.On("CreateUser", user).Return(nil)
      err := userService.CreateUser(user)
      if err != nil {
          t.Fatalf("Expectd: nil, got: %v", err)
      }
})

测试时出错

mock: Unexpected Method Call
-----------------------------

CreateUser(model.User)
        0: model.User{ID:"f87fd2f3-5801-4359-a565-a4eb13a6de37", FirebaseID:"firebaseuniqueid", FirstName:"Test", LastName:"User", FullName:"Test User", Email:"testuser@email.com", Password:"password"}

The closest call I have is: 

CreateUser(model.User)
        0: model.User{ID:"", FirebaseID:"firebaseuniqueid", FirstName:"Test", LastName:"User", FullName:"Test User", Email:"testuser@email.com", Password:"password"}

Difference found in argument 0:

--- Expected
+++ Actual
@@ -1,3 +1,3 @@
 (model.User) {
- ID: (string) "",
+ ID: (string) (len=36) "f87fd2f3-5801-4359-a565-a4eb13a6de37",
  FirebaseID: (string) (len=16) "firebaseuniqueid",

Diff: 0: FAIL:  (model.User={f87fd2f3-5801-4359-a565-a4eb13a6de37 firebaseuniqueid Test User Test User testuser@email.com  password}) != (model.User={ firebaseuniqueid Test User Test User testuser@email.com  password}) [recovered]

有什么方法可以检查动态创建的 uuid 或忽略测试中结构中的值吗？

Answer 1

如果您不想考虑 mockFirebaseAuthClient.On("CreateUser", user).Return("firebaseuniqueid", nil) 和 mockPostgresRepo.On("CreateUser", user).Return(nil) 并且只想模拟该调用，那么您可以在两个调用中使用 mock.Anything 作为参数而不是user 这样 mockFirebaseAuthClient.On("CreateUser", mock.Anything).Return("firebaseuniqueid", nil) 。因此将不考虑参数，模拟调用将 return 所需值。

Answer 2

关于你的问题

Since uuid is not injected into the service layer, how can it be mocked? It is an imported package.

像这样，首先，用我们想要模拟的相同方法定义一个接口

type uuidGen interface {
    String() string
}

然后，定义一个模拟类型，我们将在其中定义我们的方法

type mockGen struct{}

然后，在类型上定义方法

func (u *mockGen) String() string {
    return "test"
}

更新 CreateUser 函数以接收与 uuid 的包共享方法 String() 的 uuidGen 参数。

func (u userService) CreateUser(uuid uuidGen, user User) error {
    err := validateFields(user)
    if err != nil {
        return fmt.Errorf("userService CreateUser: %w", err)
    }
    user.FullName = user.FirstName + " " + user.LastName
    user.FirebaseID, err = u.authClient.CreateUser(user)
    if err != nil {
        return fmt.Errorf("authClient CreateUser: %w", err)
    }
    user.ID = uuid.String()
    err = u.userRepo.CreateUser(user)
    if err != nil {
        return fmt.Errorf("userService CreateUser: %w", err)
    }
    return nil
}

现在我们可以这样写测试了，看看这2个方法如何接受实现接口uuidGen的不同类型，并且可以调用一个方法String()

func TestCreateUser(t *testing.T) {
    mockFirebaseAuthClient := new(MockFirebaseAuthClient)
    mockPostgresRepo := new(MockPostgresRepo)
    userService := NewUserService("test", "test")

    t.Run("Valid data", func(t *testing.T) {
            user := User{
                    ID:         "",
                    FirebaseID: "firebaseuniqueid",
                    FirstName:  "Test",
                    LastName:   "User",
                    FullName:   "Test User",
                    Email:      "testuser@email.com",
                    Password:   "password",
            }
            mockFirebaseAuthClient.On("CreateUser", user).Return("firebaseuniqueid", nil)
            mockPostgresRepo.On("CreateUser", user).Return(nil)
            gen := new(mockGen)
            err := userService.CreateUser(gen, user)
            if err != nil {
                    t.Fatalf("Expectd: nil, got: %v", err)
            }
            realUUID := uuid.New()
            err = userService.CreateUser(realUUID, user)
            if err != nil {
                    t.Fatalf("Expectd: nil, got: %v", err)
            }
            t.Log("Mock UUID:", gen.String())  // prints test
            t.Log("Real UUID UUID:", realUUID.String()) // prints a UUID
    })
}

运行它与 go test -v 一起看 t.Log(...)

的输出

使用 testify 检查结构中字段的动态值

Check dynamic value for field in struct in go using testify

unit-testing

go

mocking

testify