feat: domain finished

domain/entity/book/book.go

@@ -0,0 +1,18 @@
+package book
+
+import (
+	"time"
+
+	"github.com/eminetto/clean-architecture-go-v2/domain/entity"
+)
+
+//Book data
+type Book struct {
+	ID        entity.ID
+	Title     string
+	Author    string
+	Pages     int
+	Quantity  int
+	CreatedAt time.Time
+	UpdatedAt time.Time
+}

domain/entity/book/fixture.go

@@ -0,0 +1,18 @@
+package book
+
+import (
+	"time"
+
+	"github.com/eminetto/clean-architecture-go-v2/domain/entity"
+)
+
+func NewFixtureBook() *Book {
+	return &Book{
+		ID:        entity.NewID(),
+		Title:     "I Am Ozzy",
+		Author:    "Ozzy Osbourne",
+		Pages:     294,
+		Quantity:  1,
+		CreatedAt: time.Now(),
+	}
+}

domain/entity/book/interface.go

@@ -0,0 +1,29 @@
+package book
+
+import "github.com/eminetto/clean-architecture-go-v2/domain/entity"
+
+//Reader interface
+type Reader interface {
+	Get(id entity.ID) (*Book, error)
+	Search(query string) ([]*Book, error)
+	List() ([]*Book, error)
+}
+
+//Writer book writer
+type Writer interface {
+	Create(e *Book) (entity.ID, error)
+	Update(e *Book) error
+	Delete(id entity.ID) error
+}
+
+//Repository repository interface
+type Repository interface {
+	Reader
+	Writer
+}
+
+//UseCase use case interface
+type UseCase interface {
+	Reader
+	Writer
+}

domain/entity/book/mock/book.go

@@ -0,0 +1,368 @@
+// Code generated by MockGen. DO NOT EDIT.
+// Source: domain/entity/book/interface.go
+
+// Package mock is a generated GoMock package.
+package mock
+
+import (
+	entity "github.com/eminetto/clean-architecture-go-v2/domain/entity"
+	book "github.com/eminetto/clean-architecture-go-v2/domain/entity/book"
+	gomock "github.com/golang/mock/gomock"
+	reflect "reflect"
+)
+
+// MockReader is a mock of Reader interface
+type MockReader struct {
+	ctrl     *gomock.Controller
+	recorder *MockReaderMockRecorder
+}
+
+// MockReaderMockRecorder is the mock recorder for MockReader
+type MockReaderMockRecorder struct {
+	mock *MockReader
+}
+
+// NewMockReader creates a new mock instance
+func NewMockReader(ctrl *gomock.Controller) *MockReader {
+	mock := &MockReader{ctrl: ctrl}
+	mock.recorder = &MockReaderMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use
+func (m *MockReader) EXPECT() *MockReaderMockRecorder {
+	return m.recorder
+}
+
+// Get mocks base method
+func (m *MockReader) Get(id entity.ID) (*book.Book, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Get", id)
+	ret0, _ := ret[0].(*book.Book)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// Get indicates an expected call of Get
+func (mr *MockReaderMockRecorder) Get(id interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Get", reflect.TypeOf((*MockReader)(nil).Get), id)
+}
+
+// Search mocks base method
+func (m *MockReader) Search(query string) ([]*book.Book, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Search", query)
+	ret0, _ := ret[0].([]*book.Book)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// Search indicates an expected call of Search
+func (mr *MockReaderMockRecorder) Search(query interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Search", reflect.TypeOf((*MockReader)(nil).Search), query)
+}
+
+// List mocks base method
+func (m *MockReader) List() ([]*book.Book, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "List")
+	ret0, _ := ret[0].([]*book.Book)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// List indicates an expected call of List
+func (mr *MockReaderMockRecorder) List() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "List", reflect.TypeOf((*MockReader)(nil).List))
+}
+
+// MockWriter is a mock of Writer interface
+type MockWriter struct {
+	ctrl     *gomock.Controller
+	recorder *MockWriterMockRecorder
+}
+
+// MockWriterMockRecorder is the mock recorder for MockWriter
+type MockWriterMockRecorder struct {
+	mock *MockWriter
+}
+
+// NewMockWriter creates a new mock instance
+func NewMockWriter(ctrl *gomock.Controller) *MockWriter {
+	mock := &MockWriter{ctrl: ctrl}
+	mock.recorder = &MockWriterMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use
+func (m *MockWriter) EXPECT() *MockWriterMockRecorder {
+	return m.recorder
+}
+
+// Create mocks base method
+func (m *MockWriter) Create(e *book.Book) (entity.ID, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Create", e)
+	ret0, _ := ret[0].(entity.ID)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// Create indicates an expected call of Create
+func (mr *MockWriterMockRecorder) Create(e interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Create", reflect.TypeOf((*MockWriter)(nil).Create), e)
+}
+
+// Update mocks base method
+func (m *MockWriter) Update(e *book.Book) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Update", e)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// Update indicates an expected call of Update
+func (mr *MockWriterMockRecorder) Update(e interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Update", reflect.TypeOf((*MockWriter)(nil).Update), e)
+}
+
+// Delete mocks base method
+func (m *MockWriter) Delete(id entity.ID) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Delete", id)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// Delete indicates an expected call of Delete
+func (mr *MockWriterMockRecorder) Delete(id interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Delete", reflect.TypeOf((*MockWriter)(nil).Delete), id)
+}
+
+// MockRepository is a mock of Repository interface
+type MockRepository struct {
+	ctrl     *gomock.Controller
+	recorder *MockRepositoryMockRecorder
+}
+
+// MockRepositoryMockRecorder is the mock recorder for MockRepository
+type MockRepositoryMockRecorder struct {
+	mock *MockRepository
+}
+
+// NewMockRepository creates a new mock instance
+func NewMockRepository(ctrl *gomock.Controller) *MockRepository {
+	mock := &MockRepository{ctrl: ctrl}
+	mock.recorder = &MockRepositoryMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use
+func (m *MockRepository) EXPECT() *MockRepositoryMockRecorder {
+	return m.recorder
+}
+
+// Get mocks base method
+func (m *MockRepository) Get(id entity.ID) (*book.Book, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Get", id)
+	ret0, _ := ret[0].(*book.Book)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// Get indicates an expected call of Get
+func (mr *MockRepositoryMockRecorder) Get(id interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Get", reflect.TypeOf((*MockRepository)(nil).Get), id)
+}
+
+// Search mocks base method
+func (m *MockRepository) Search(query string) ([]*book.Book, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Search", query)
+	ret0, _ := ret[0].([]*book.Book)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// Search indicates an expected call of Search
+func (mr *MockRepositoryMockRecorder) Search(query interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Search", reflect.TypeOf((*MockRepository)(nil).Search), query)
+}
+
+// List mocks base method
+func (m *MockRepository) List() ([]*book.Book, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "List")
+	ret0, _ := ret[0].([]*book.Book)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// List indicates an expected call of List
+func (mr *MockRepositoryMockRecorder) List() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "List", reflect.TypeOf((*MockRepository)(nil).List))
+}
+
+// Create mocks base method
+func (m *MockRepository) Create(e *book.Book) (entity.ID, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Create", e)
+	ret0, _ := ret[0].(entity.ID)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// Create indicates an expected call of Create
+func (mr *MockRepositoryMockRecorder) Create(e interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Create", reflect.TypeOf((*MockRepository)(nil).Create), e)
+}
+
+// Update mocks base method
+func (m *MockRepository) Update(e *book.Book) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Update", e)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// Update indicates an expected call of Update
+func (mr *MockRepositoryMockRecorder) Update(e interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Update", reflect.TypeOf((*MockRepository)(nil).Update), e)
+}
+
+// Delete mocks base method
+func (m *MockRepository) Delete(id entity.ID) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Delete", id)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// Delete indicates an expected call of Delete
+func (mr *MockRepositoryMockRecorder) Delete(id interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Delete", reflect.TypeOf((*MockRepository)(nil).Delete), id)
+}
+
+// MockUseCase is a mock of UseCase interface
+type MockUseCase struct {
+	ctrl     *gomock.Controller
+	recorder *MockUseCaseMockRecorder
+}
+
+// MockUseCaseMockRecorder is the mock recorder for MockUseCase
+type MockUseCaseMockRecorder struct {
+	mock *MockUseCase
+}
+
+// NewMockUseCase creates a new mock instance
+func NewMockUseCase(ctrl *gomock.Controller) *MockUseCase {
+	mock := &MockUseCase{ctrl: ctrl}
+	mock.recorder = &MockUseCaseMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use
+func (m *MockUseCase) EXPECT() *MockUseCaseMockRecorder {
+	return m.recorder
+}
+
+// Get mocks base method
+func (m *MockUseCase) Get(id entity.ID) (*book.Book, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Get", id)
+	ret0, _ := ret[0].(*book.Book)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// Get indicates an expected call of Get
+func (mr *MockUseCaseMockRecorder) Get(id interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Get", reflect.TypeOf((*MockUseCase)(nil).Get), id)
+}
+
+// Search mocks base method
+func (m *MockUseCase) Search(query string) ([]*book.Book, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Search", query)
+	ret0, _ := ret[0].([]*book.Book)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// Search indicates an expected call of Search
+func (mr *MockUseCaseMockRecorder) Search(query interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Search", reflect.TypeOf((*MockUseCase)(nil).Search), query)
+}
+
+// List mocks base method
+func (m *MockUseCase) List() ([]*book.Book, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "List")
+	ret0, _ := ret[0].([]*book.Book)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// List indicates an expected call of List
+func (mr *MockUseCaseMockRecorder) List() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "List", reflect.TypeOf((*MockUseCase)(nil).List))
+}
+
+// Create mocks base method
+func (m *MockUseCase) Create(e *book.Book) (entity.ID, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Create", e)
+	ret0, _ := ret[0].(entity.ID)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// Create indicates an expected call of Create
+func (mr *MockUseCaseMockRecorder) Create(e interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Create", reflect.TypeOf((*MockUseCase)(nil).Create), e)
+}
+
+// Update mocks base method
+func (m *MockUseCase) Update(e *book.Book) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Update", e)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// Update indicates an expected call of Update
+func (mr *MockUseCaseMockRecorder) Update(e interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Update", reflect.TypeOf((*MockUseCase)(nil).Update), e)
+}
+
+// Delete mocks base method
+func (m *MockUseCase) Delete(id entity.ID) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Delete", id)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// Delete indicates an expected call of Delete
+func (mr *MockUseCaseMockRecorder) Delete(id interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Delete", reflect.TypeOf((*MockUseCase)(nil).Delete), id)
+}

domain/entity/book/repository_inmem.go

@@ -0,0 +1,78 @@
+package book
+
+import (
+	"strings"
+
+	"github.com/eminetto/clean-architecture-go-v2/domain"
+	"github.com/eminetto/clean-architecture-go-v2/domain/entity"
+)
+
+//IRepo in memory repo
+type IRepo struct {
+	m map[entity.ID]*Book
+}
+
+//NewInmemRepository create new repository
+func NewInmemRepository() *IRepo {
+	var m = map[entity.ID]*Book{}
+	return &IRepo{
+		m: m,
+	}
+}
+
+//Create a book
+func (r *IRepo) Create(e *Book) (entity.ID, error) {
+	r.m[e.ID] = e
+	return e.ID, nil
+}
+
+//Get a book
+func (r *IRepo) Get(id entity.ID) (*Book, error) {
+	if r.m[id] == nil {
+		return nil, domain.ErrNotFound
+	}
+	return r.m[id], nil
+}
+
+//Update a book
+func (r *IRepo) Update(e *Book) error {
+	_, err := r.Get(e.ID)
+	if err != nil {
+		return err
+	}
+	r.m[e.ID] = e
+	return nil
+}
+
+//Search books
+func (r *IRepo) Search(query string) ([]*Book, error) {
+	var d []*Book
+	for _, j := range r.m {
+		if strings.Contains(strings.ToLower(j.Title), query) {
+			d = append(d, j)
+		}
+	}
+	if len(d) == 0 {
+		return nil, domain.ErrNotFound
+	}
+
+	return d, nil
+}
+
+//List books
+func (r *IRepo) List() ([]*Book, error) {
+	var d []*Book
+	for _, j := range r.m {
+		d = append(d, j)
+	}
+	return d, nil
+}
+
+//Delete a book
+func (r *IRepo) Delete(id entity.ID) error {
+	if r.m[id] == nil {
+		return domain.ErrNotFound
+	}
+	r.m[id] = nil
+	return nil
+}

domain/entity/book/service.go

@@ -0,0 +1,56 @@
+package book
+
+import (
+	"strings"
+	"time"
+
+	"github.com/eminetto/clean-architecture-go-v2/domain/entity"
+)
+
+//Service service interface
+type Service struct {
+	repo Repository
+}
+
+//NewService create new use case
+func NewService(r Repository) *Service {
+	return &Service{
+		repo: r,
+	}
+}
+
+//Create a book
+func (s *Service) Create(e *Book) (entity.ID, error) {
+	e.ID = entity.NewID()
+	e.CreatedAt = time.Now()
+	return s.repo.Create(e)
+}
+
+//Get a book
+func (s *Service) Get(id entity.ID) (*Book, error) {
+	return s.repo.Get(id)
+}
+
+//Search books
+func (s *Service) Search(query string) ([]*Book, error) {
+	return s.repo.Search(strings.ToLower(query))
+}
+
+//List books
+func (s *Service) List() ([]*Book, error) {
+	return s.repo.List()
+}
+
+//Delete a book
+func (s *Service) Delete(id entity.ID) error {
+	_, err := s.Get(id)
+	if err != nil {
+		return err
+	}
+	return s.repo.Delete(id)
+}
+
+//Update a book
+func (s *Service) Update(e *Book) error {
+	return s.repo.Update(e)
+}

domain/entity/book/service_test.go

@@ -0,0 +1,81 @@
+package book
+
+import (
+	"github.com/eminetto/clean-architecture-go-v2/domain"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func Test_Create(t *testing.T) {
+	repo := NewInmemRepository()
+	service := NewService(repo)
+	u := NewFixtureBook()
+	id, err := service.Create(u)
+	assert.Nil(t, err)
+	assert.Equal(t, u.ID, id)
+	assert.False(t, u.CreatedAt.IsZero())
+}
+
+func Test_SearchAndFind(t *testing.T) {
+	repo := NewInmemRepository()
+	service := NewService(repo)
+	u1 := NewFixtureBook()
+	u2 := NewFixtureBook()
+	u2.Title = "Lemmy: Biography"
+
+	uID, _ := service.Create(u1)
+	_, _ = service.Create(u2)
+
+	t.Run("search", func(t *testing.T) {
+		c, err := service.Search("ozzy")
+		assert.Nil(t, err)
+		assert.Equal(t, 1, len(c))
+		assert.Equal(t, "I Am Ozzy", c[0].Title)
+
+		c, err = service.Search("dio")
+		assert.Equal(t, domain.ErrNotFound, err)
+		assert.Nil(t, c)
+	})
+	t.Run("list all", func(t *testing.T) {
+		all, err := service.List()
+		assert.Nil(t, err)
+		assert.Equal(t, 2, len(all))
+	})
+
+	t.Run("get", func(t *testing.T) {
+		saved, err := service.Get(uID)
+		assert.Nil(t, err)
+		assert.Equal(t, u1.Title, saved.Title)
+	})
+}
+
+func Test_Update(t *testing.T) {
+	repo := NewInmemRepository()
+	service := NewService(repo)
+	u := NewFixtureBook()
+	id, err := service.Create(u)
+	assert.Nil(t, err)
+	saved, _ := service.Get(id)
+	saved.Title = "Lemmy: Biography"
+	assert.Nil(t, service.Update(saved))
+	updated, err := service.Get(id)
+	assert.Nil(t, err)
+	assert.Equal(t, "Lemmy: Biography", updated.Title)
+}
+
+func TestDelete(t *testing.T) {
+	repo := NewInmemRepository()
+	service := NewService(repo)
+	u1 := NewFixtureBook()
+	u2 := NewFixtureBook()
+	u2ID, _ := service.Create(u2)
+
+	err := service.Delete(u1.ID)
+	assert.Equal(t, domain.ErrNotFound, err)
+
+	err = service.Delete(u2ID)
+	assert.Nil(t, err)
+	_, err = service.Get(u2ID)
+	assert.Equal(t, domain.ErrNotFound, err)
+}

domain/entity/entity.go

@@ -0,0 +1,16 @@
+package entity
+
+import "github.com/google/uuid"
+
+type ID = uuid.UUID
+
+func NewID() ID {
+	return ID(uuid.New())
+}
+
+func StringToID(s string) (ID, error) {
+	id, err := uuid.Parse(s)
+	return ID(id), err
+}
+
+

domain/entity/user/fixture.go

@@ -0,0 +1,16 @@
+package user
+
+import (
+	"github.com/eminetto/clean-architecture-go-v2/domain/entity"
+	"time"
+)
+
+func NewFixtureUser() *User {
+	return  &User{
+		ID: entity.NewID(),
+		Email:"[email protected]",
+		FirstName:"Ozzy",
+		LastName: "Osbourne",
+		CreatedAt: time.Now(),
+	}
+}

domain/entity/user/interface.go

@@ -0,0 +1,29 @@
+package user
+
+import "github.com/eminetto/clean-architecture-go-v2/domain/entity"
+
+//Reader interface
+type Reader interface {
+	Get(id entity.ID) (*User, error)
+	Search(query string) ([]*User, error)
+	List() ([]*User, error)
+}
+
+//Writer user writer
+type Writer interface {
+	Create(e *User) (entity.ID, error)
+	Update(e *User) error
+	Delete(id entity.ID) error
+}
+
+//Repository repository interface
+type Repository interface {
+	Reader
+	Writer
+}
+
+//UseCase use case interface
+type UseCase interface {
+	Reader
+	Writer
+}

domain/entity/user/mock/user.go

@@ -0,0 +1,368 @@
+// Code generated by MockGen. DO NOT EDIT.
+// Source: domain/entity/user/interface.go
+
+// Package mock is a generated GoMock package.
+package mock
+
+import (
+	entity "github.com/eminetto/clean-architecture-go-v2/domain/entity"
+	user "github.com/eminetto/clean-architecture-go-v2/domain/entity/user"
+	gomock "github.com/golang/mock/gomock"
+	reflect "reflect"
+)
+
+// MockReader is a mock of Reader interface
+type MockReader struct {
+	ctrl     *gomock.Controller
+	recorder *MockReaderMockRecorder
+}
+
+// MockReaderMockRecorder is the mock recorder for MockReader
+type MockReaderMockRecorder struct {
+	mock *MockReader
+}
+
+// NewMockReader creates a new mock instance
+func NewMockReader(ctrl *gomock.Controller) *MockReader {
+	mock := &MockReader{ctrl: ctrl}
+	mock.recorder = &MockReaderMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use
+func (m *MockReader) EXPECT() *MockReaderMockRecorder {
+	return m.recorder
+}
+
+// Get mocks base method
+func (m *MockReader) Get(id entity.ID) (*user.User, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Get", id)
+	ret0, _ := ret[0].(*user.User)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// Get indicates an expected call of Get
+func (mr *MockReaderMockRecorder) Get(id interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Get", reflect.TypeOf((*MockReader)(nil).Get), id)
+}
+
+// Search mocks base method
+func (m *MockReader) Search(query string) ([]*user.User, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Search", query)
+	ret0, _ := ret[0].([]*user.User)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// Search indicates an expected call of Search
+func (mr *MockReaderMockRecorder) Search(query interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Search", reflect.TypeOf((*MockReader)(nil).Search), query)
+}
+
+// List mocks base method
+func (m *MockReader) List() ([]*user.User, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "List")
+	ret0, _ := ret[0].([]*user.User)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// List indicates an expected call of List
+func (mr *MockReaderMockRecorder) List() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "List", reflect.TypeOf((*MockReader)(nil).List))
+}
+
+// MockWriter is a mock of Writer interface
+type MockWriter struct {
+	ctrl     *gomock.Controller
+	recorder *MockWriterMockRecorder
+}
+
+// MockWriterMockRecorder is the mock recorder for MockWriter
+type MockWriterMockRecorder struct {
+	mock *MockWriter
+}
+
+// NewMockWriter creates a new mock instance
+func NewMockWriter(ctrl *gomock.Controller) *MockWriter {
+	mock := &MockWriter{ctrl: ctrl}
+	mock.recorder = &MockWriterMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use
+func (m *MockWriter) EXPECT() *MockWriterMockRecorder {
+	return m.recorder
+}
+
+// Create mocks base method
+func (m *MockWriter) Create(e *user.User) (entity.ID, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Create", e)
+	ret0, _ := ret[0].(entity.ID)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// Create indicates an expected call of Create
+func (mr *MockWriterMockRecorder) Create(e interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Create", reflect.TypeOf((*MockWriter)(nil).Create), e)
+}
+
+// Update mocks base method
+func (m *MockWriter) Update(e *user.User) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Update", e)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// Update indicates an expected call of Update
+func (mr *MockWriterMockRecorder) Update(e interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Update", reflect.TypeOf((*MockWriter)(nil).Update), e)
+}
+
+// Delete mocks base method
+func (m *MockWriter) Delete(id entity.ID) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Delete", id)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// Delete indicates an expected call of Delete
+func (mr *MockWriterMockRecorder) Delete(id interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Delete", reflect.TypeOf((*MockWriter)(nil).Delete), id)
+}
+
+// MockRepository is a mock of Repository interface
+type MockRepository struct {
+	ctrl     *gomock.Controller
+	recorder *MockRepositoryMockRecorder
+}
+
+// MockRepositoryMockRecorder is the mock recorder for MockRepository
+type MockRepositoryMockRecorder struct {
+	mock *MockRepository
+}
+
+// NewMockRepository creates a new mock instance
+func NewMockRepository(ctrl *gomock.Controller) *MockRepository {
+	mock := &MockRepository{ctrl: ctrl}
+	mock.recorder = &MockRepositoryMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use
+func (m *MockRepository) EXPECT() *MockRepositoryMockRecorder {
+	return m.recorder
+}
+
+// Get mocks base method
+func (m *MockRepository) Get(id entity.ID) (*user.User, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Get", id)
+	ret0, _ := ret[0].(*user.User)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// Get indicates an expected call of Get
+func (mr *MockRepositoryMockRecorder) Get(id interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Get", reflect.TypeOf((*MockRepository)(nil).Get), id)
+}
+
+// Search mocks base method
+func (m *MockRepository) Search(query string) ([]*user.User, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Search", query)
+	ret0, _ := ret[0].([]*user.User)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// Search indicates an expected call of Search
+func (mr *MockRepositoryMockRecorder) Search(query interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Search", reflect.TypeOf((*MockRepository)(nil).Search), query)
+}
+
+// List mocks base method
+func (m *MockRepository) List() ([]*user.User, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "List")
+	ret0, _ := ret[0].([]*user.User)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// List indicates an expected call of List
+func (mr *MockRepositoryMockRecorder) List() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "List", reflect.TypeOf((*MockRepository)(nil).List))
+}
+
+// Create mocks base method
+func (m *MockRepository) Create(e *user.User) (entity.ID, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Create", e)
+	ret0, _ := ret[0].(entity.ID)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// Create indicates an expected call of Create
+func (mr *MockRepositoryMockRecorder) Create(e interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Create", reflect.TypeOf((*MockRepository)(nil).Create), e)
+}
+
+// Update mocks base method
+func (m *MockRepository) Update(e *user.User) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Update", e)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// Update indicates an expected call of Update
+func (mr *MockRepositoryMockRecorder) Update(e interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Update", reflect.TypeOf((*MockRepository)(nil).Update), e)
+}
+
+// Delete mocks base method
+func (m *MockRepository) Delete(id entity.ID) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Delete", id)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// Delete indicates an expected call of Delete
+func (mr *MockRepositoryMockRecorder) Delete(id interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Delete", reflect.TypeOf((*MockRepository)(nil).Delete), id)
+}
+
+// MockUseCase is a mock of UseCase interface
+type MockUseCase struct {
+	ctrl     *gomock.Controller
+	recorder *MockUseCaseMockRecorder
+}
+
+// MockUseCaseMockRecorder is the mock recorder for MockUseCase
+type MockUseCaseMockRecorder struct {
+	mock *MockUseCase
+}
+
+// NewMockUseCase creates a new mock instance
+func NewMockUseCase(ctrl *gomock.Controller) *MockUseCase {
+	mock := &MockUseCase{ctrl: ctrl}
+	mock.recorder = &MockUseCaseMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use
+func (m *MockUseCase) EXPECT() *MockUseCaseMockRecorder {
+	return m.recorder
+}
+
+// Get mocks base method
+func (m *MockUseCase) Get(id entity.ID) (*user.User, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Get", id)
+	ret0, _ := ret[0].(*user.User)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// Get indicates an expected call of Get
+func (mr *MockUseCaseMockRecorder) Get(id interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Get", reflect.TypeOf((*MockUseCase)(nil).Get), id)
+}
+
+// Search mocks base method
+func (m *MockUseCase) Search(query string) ([]*user.User, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Search", query)
+	ret0, _ := ret[0].([]*user.User)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// Search indicates an expected call of Search
+func (mr *MockUseCaseMockRecorder) Search(query interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Search", reflect.TypeOf((*MockUseCase)(nil).Search), query)
+}
+
+// List mocks base method
+func (m *MockUseCase) List() ([]*user.User, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "List")
+	ret0, _ := ret[0].([]*user.User)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// List indicates an expected call of List
+func (mr *MockUseCaseMockRecorder) List() *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "List", reflect.TypeOf((*MockUseCase)(nil).List))
+}
+
+// Create mocks base method
+func (m *MockUseCase) Create(e *user.User) (entity.ID, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Create", e)
+	ret0, _ := ret[0].(entity.ID)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// Create indicates an expected call of Create
+func (mr *MockUseCaseMockRecorder) Create(e interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Create", reflect.TypeOf((*MockUseCase)(nil).Create), e)
+}
+
+// Update mocks base method
+func (m *MockUseCase) Update(e *user.User) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Update", e)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// Update indicates an expected call of Update
+func (mr *MockUseCaseMockRecorder) Update(e interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Update", reflect.TypeOf((*MockUseCase)(nil).Update), e)
+}
+
+// Delete mocks base method
+func (m *MockUseCase) Delete(id entity.ID) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Delete", id)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// Delete indicates an expected call of Delete
+func (mr *MockUseCaseMockRecorder) Delete(id interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Delete", reflect.TypeOf((*MockUseCase)(nil).Delete), id)
+}

domain/entity/user/repository_inmem.go

@@ -0,0 +1,78 @@
+package user
+
+import (
+	"strings"
+
+	"github.com/eminetto/clean-architecture-go-v2/domain"
+	"github.com/eminetto/clean-architecture-go-v2/domain/entity"
+)
+
+//IRepo in memory repo
+type IRepo struct {
+	m map[entity.ID]*User
+}
+
+//NewInmemRepository create new repository
+func NewInmemRepository() *IRepo {
+	var m = map[entity.ID]*User{}
+	return &IRepo{
+		m: m,
+	}
+}
+
+//Create an user
+func (r *IRepo) Create(e *User) (entity.ID, error) {
+	r.m[e.ID] = e
+	return e.ID, nil
+}
+
+//Get an user
+func (r *IRepo) Get(id entity.ID) (*User, error) {
+	if r.m[id] == nil {
+		return nil, domain.ErrNotFound
+	}
+	return r.m[id], nil
+}
+
+//Update an user
+func (r *IRepo) Update(e *User) error {
+	_, err := r.Get(e.ID)
+	if err != nil {
+		return err
+	}
+	r.m[e.ID] = e
+	return nil
+}
+
+//Search users
+func (r *IRepo) Search(query string) ([]*User, error) {
+	var d []*User
+	for _, j := range r.m {
+		if strings.Contains(strings.ToLower(j.FirstName), query) {
+			d = append(d, j)
+		}
+	}
+	if len(d) == 0 {
+		return nil, domain.ErrNotFound
+	}
+
+	return d, nil
+}
+
+//List users
+func (r *IRepo) List() ([]*User, error) {
+	var d []*User
+	for _, j := range r.m {
+		d = append(d, j)
+	}
+	return d, nil
+}
+
+//Delete an user
+func (r *IRepo) Delete(id entity.ID) error {
+	if r.m[id] == nil {
+		return domain.ErrNotFound
+	}
+	r.m[id] = nil
+	return nil
+}

domain/entity/user/service.go

@@ -0,0 +1,57 @@
+package user
+
+import (
+	"strings"
+	"time"
+
+	"github.com/eminetto/clean-architecture-go-v2/domain/entity"
+)
+
+//Service service interface
+type Service struct {
+	repo Repository
+}
+
+//NewService create new use case
+func NewService(r Repository) *Service {
+	return &Service{
+		repo: r,
+	}
+}
+
+//Create an user
+func (s *Service) Create(e *User) (entity.ID, error) {
+	e.ID = entity.NewID()
+	e.CreatedAt = time.Now()
+	return s.repo.Create(e)
+}
+
+//Get an user
+func (s *Service) Get(id entity.ID) (*User, error) {
+	return s.repo.Get(id)
+}
+
+//Search users
+func (s *Service) Search(query string) ([]*User, error) {
+	return s.repo.Search(strings.ToLower(query))
+}
+
+//List users
+func (s *Service) List() ([]*User, error) {
+	return s.repo.List()
+}
+
+//Delete an user
+func (s *Service) Delete(id entity.ID) error {
+	_, err := s.Get(id)
+	if err != nil {
+		return err
+	}
+	return s.repo.Delete(id)
+}
+
+//Update an user
+func (s *Service) Update(e *User) error {
+	e.UpdatedAt = time.Now()
+	return s.repo.Update(e)
+}

domain/entity/user/service_test.go

@@ -0,0 +1,87 @@
+package user
+
+import (
+	"testing"
+
+	"github.com/eminetto/clean-architecture-go-v2/domain"
+	"github.com/eminetto/clean-architecture-go-v2/domain/entity"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func Test_Create(t *testing.T) {
+	repo := NewInmemRepository()
+	service := NewService(repo)
+	u := NewFixtureUser()
+	id, err := service.Create(u)
+	assert.Nil(t, err)
+	assert.Equal(t, u.ID, id)
+	assert.False(t, u.CreatedAt.IsZero())
+	assert.True(t, u.UpdatedAt.IsZero())
+}
+
+func Test_SearchAndFind(t *testing.T) {
+	repo := NewInmemRepository()
+	service := NewService(repo)
+	u1 := NewFixtureUser()
+	u2 := NewFixtureUser()
+	u2.FirstName = "Lemmy"
+
+	uID, _ := service.Create(u1)
+	_, _ = service.Create(u2)
+
+	t.Run("search", func(t *testing.T) {
+		c, err := service.Search("ozzy")
+		assert.Nil(t, err)
+		assert.Equal(t, 1, len(c))
+		assert.Equal(t, "Osbourne", c[0].LastName)
+
+		c, err = service.Search("dio")
+		assert.Equal(t, domain.ErrNotFound, err)
+		assert.Nil(t, c)
+	})
+	t.Run("list all", func(t *testing.T) {
+		all, err := service.List()
+		assert.Nil(t, err)
+		assert.Equal(t, 2, len(all))
+	})
+
+	t.Run("get", func(t *testing.T) {
+		saved, err := service.Get(uID)
+		assert.Nil(t, err)
+		assert.Equal(t, u1.FirstName, saved.FirstName)
+	})
+}
+
+func Test_Update(t *testing.T) {
+	repo := NewInmemRepository()
+	service := NewService(repo)
+	u := NewFixtureUser()
+	id, err := service.Create(u)
+	assert.Nil(t, err)
+	saved, _ := service.Get(id)
+	saved.FirstName = "Dio"
+	saved.Books = append(saved.Books, entity.NewID())
+	assert.Nil(t, service.Update(saved))
+	updated, err := service.Get(id)
+	assert.Nil(t, err)
+	assert.Equal(t, "Dio", updated.FirstName)
+	assert.False(t, u.UpdatedAt.IsZero())
+	assert.Equal(t, 1, len(updated.Books))
+}
+
+func TestDelete(t *testing.T) {
+	repo := NewInmemRepository()
+	service := NewService(repo)
+	u1 := NewFixtureUser()
+	u2 := NewFixtureUser()
+	u2ID, _ := service.Create(u2)
+
+	err := service.Delete(u1.ID)
+	assert.Equal(t, domain.ErrNotFound, err)
+
+	err = service.Delete(u2ID)
+	assert.Nil(t, err)
+	_, err = service.Get(u2ID)
+	assert.Equal(t, domain.ErrNotFound, err)
+}

domain/entity/user/user.go

@@ -0,0 +1,19 @@
+package user
+
+import (
+	"time"
+
+	"github.com/eminetto/clean-architecture-go-v2/domain/entity"
+)
+
+//User data
+type User struct {
+	ID        entity.ID
+	Email     string
+	Password  string
+	FirstName string
+	LastName  string
+	CreatedAt time.Time
+	UpdatedAt time.Time
+	Books     []entity.ID
+}