Test-Driven-Development-in-Go

Test-Driven-Development-in-Go

This repository contains the code examples corresponding to the book Test-Driven Development in Go, published by Packt.

Dependencies

You will need the following tools to run your the code in this repository:

• Go 1.19 or later
• PostgresSQL 15 or later
• Docker 4.17 or later

This project depends on a variety of testing tools, which are used for instruction and demonstration purposes:

• testify
• mockery
• golang-migrate
• ginkgo
• godog
• pact

Run locally

From Chapter06 onwards, you will require a database to run the BookSwap application:

1. Install PostgresSQL according to the installation steps for your operating system.
2. Export the following user variables:

$ export BOOKSWAP_DB_URL=XXX
$ export BOOKSWAP_PORT=XXX
$ export BOOKSWAP_BASE_URL=XXX

1. Run the BookSwap executable using the go run chapterXX/cmd/main.go command. The application will then listen on the configured port.

Run in Docker

From chapter06 onwards, you can run the BookSwap application with Docker:

1. Install Docker according to the installation steps for your operating system. Separate Docker configuration files have been provided for each chapter. For example, docker-compose.book-swap.chapter06.yml runs the version of the application corresponding to the chapter06 directory.
2. Create a docker.env file will all the variables required for running the application. Example values can be seen below:

POSTGRES_USER=root
POSTGRES_PASSWORD=root
POSTGRES_DB=books
BOOKSWAP_DB_URL=postgres://root:root@db:5432/books?sslmode=disable
BOOKSWAP_PORT=3000

1. Run the application using docker compose:

$  docker compose -f docker-compose.book-swap.chapterXX.yml up --build
$  docker compose -f docker-compose.book-swap.chapterXX.yml down 

1. The application will then listen on the configured port.

curl --location --request GET 'http://localhost:3000/

Generate mocks

$ mockery --dir "chapterXX" --output "chapterXX/mocks" --all

Run unit tests

1. Install all Dependencies and follow the Run locally steps.
2. Run all tests:

$ go test ./... -v

Run all tests

WARNING: as tests often require a specific version of the test endpoint to be running, I do not recommend running all tests from the root directory.

Instead, I recommend running unit & integration tests per chapter:

1. Run the Docker version of the chapterXX according to Run in Docker.
2. In a separate window, change to the desired directory cd chapterXX.
3. Run all tests in the chapterXX directory by setting to LONG commandline argument:

$ LONG=true go test ./... -v

Postman collection

For your convenience, a Postman collection with requests for the BookSwap application has been provided. See BookSwap.postman_collection.json. This file can then be used to import the collection into Postman.