Slides da talk na trilha de golang no TDC 2018. Testando API's de forma unitária mocando as dependências aborda técnicas de mocks para testes unitários em golang.

2. Testando API's de forma unitária
mocando as dependências.

3. Marcelo Aymone
Desenvolvedor de software na
Neoway

4. “Accept interfaces, return structs.”

5. type userStorage interface {
Get(id string) (*domain.User, error)
Insert(user *domain.User) (*domain.User, error)
}
type userService struct {
storage userStorage
}
func NewService(s userStorage) *userService {
return &userService{
storage: s,
}
}

6. func (u *userService) FindID(id string) (*domain.User, error) {
return u.storage.Get(id)
}
func (u *userService) Create(user *domain.User) (*domain.User, error) {
if err := user.Validate(); err != nil {
return nil, err
}
return u.storage.Insert(user)
}

10. type userStorageMock struct {
GetFn func(id string) (*domain.User, error)
InsertFn func(user *domain.User) (*domain.User, error)
}
func (s *userStorageMock) Get(id string) (*domain.User, error) {
return s.GetFn(id)
}
func (s *userStorageMock) Insert(user *domain.User) (*domain.User, error) {
return s.InsertFn(user)
}

11. expectedId := "userID"
userMock := &userStorageMock{
GetFn: func(id string) (*domain.User, error) {
assert.Equal(t, expectedId, id)
return &domain.User{
ID: id,
}, nil
},
}
userService := user.NewService(userMock)

14. Integração
Unidade
Lento
RápidoUnitários
Integração
Aceitação
Manual

17. Links
http://idiomaticgo.com/post/best-practice/accept-interfaces-return-structs/
https://medium.com/@cep21/what-accept-interfaces-return-structs-means-in-go-2fe879e25ee8
https://martinfowler.com/articles/practical-test-pyramid.html
https://blog.golang.org/cover
https://travis-ci.org/
https://goreportcard.com/
https://codeclimate.com/

18. Marcelo Bertholdt Aymone
mbaymone@gmail.com
linkedin.com/in/marceloaymone
github.com/aymone/api-unit-test