Golang-Unit-Tests

This project demonstrates how to write unit tests in Golang using the stretchr/testify package. It simulates a simple blog-like structure with users and posts, and tests the application logic in isolation using mocks.

🛠️ Technologies Used

• Golang – The main programming language
• Echo – A fast, minimalistic web framework for building REST APIs
• GORM – An ORM library for Golang to interact with MySQL
• MySQL – The relational database used for persistent storage
• Testify – Provides easy-to-use assertion and mocking capabilities for unit tests

✅ Unit Testing

We use the github.com/stretchr/testify package to write clean and expressive unit tests.

Key features:

• Table-driven tests
• Mocking interfaces (e.g., repository methods)
• Assertions like require.NoError(), require.Len(), etc.

Example Test

func TestGetUserPosts(t *testing.T) {
    mockRepo := new(mocks.PostRepoMock)
    mockRepo.On("GetUserPosts", "test@example.com").Return([]models.Post{{Title: "Post 1"}}, nil)

    posts, err := mockRepo.GetUserPosts("test@example.com")

    require.NoError(t, err)
    require.Len(t, posts, 1)

    mockRepo.AssertExpectations(t)
}

🧪 Running Tests

Make sure dependencies are installed:

go mod tidy
go mod vendor

go test ./...

🧰 Setting Up MySQL (For Real Integration)

• Create a database for the project

  CREATE DATABASE GOLANG_UNIT_TESTS;

• Update the DSN string for right user-name and password in configs/gorm.go

  func InitDatabase() {
      db, err := gorm.Open(mysql.New(mysql.Config{
          DSN: "root:shahil@tcp(127.0.0.1:3306)/GOLANG_UNIT_TESTS?charset=utf8&parseTime=True&loc=Local",
      }), &gorm.Config{})
      if err != nil {
          panic("Error connecting to the Database")
      }
  
      err = db.AutoMigrate(&models.User{}, &models.Post{})
      if err != nil {
          log.Fatal("Error auto migrating schemas", err)
      }
  
      DB = db
  }

🚀 Running the App

go run .