Mock dependency implementations for blog post example. Copy and paste from the blog post to complete

user-server.go

package main

import (
	"net/http"
	"fmt"
	"errors"
	"context"
)

// mock implementations
func NewPooledDatabaseConnection(url string) Database {
	return mockDatabase{}
}

func NewDatabaseUserManager(databaseConn Database) UserManager {
	return mockUserManager{}
}

type mockDatabase struct {}

type mockUserManager struct {}

func (um mockUserManager) GetUser(id int) (user User, e error) {
	if id == 1 {
		user = mockUser{id: 1, name: "John Doe"}
	} else {
		e = errors.New("User not found.")
	}
	return
}

func (um mockUserManager) AuthenticateUser(username, password string) (id int, e error) {
	if username == "john.d" && password == "1234" {
		id = 1
	} else {
		e = errors.New("Invalid username or password.")
	}
	return
}

type mockUser struct {
	id int
	name string
}

func (u mockUser) Id() int {
	return u.id
}

func (u mockUser) Name() string {
	return u.name
}

// dependency interfaces


// authentication middleware


// http handler


// main function