Test-Driven Development: It's easier than you think!

Think test-driven development is slow? Watch a fully tested microservice get built from scratch in under 25 minutes.

#1about 3 minutes

Understanding the principles of test-driven development

Test-driven development is introduced as a practical approach to ensure code quality by building a pet adoption application with a REST API, Kafka, and a Postgres database.

#2about 2 minutes

Setting up a new Quarkus project in IntelliJ

A new Quarkus application is created using IntelliJ, selecting necessary extensions like REST with Jackson, Hibernate ORM, and the Postgres driver.

#3about 1 minute

Exploring Quarkus Dev Mode and Dev Services

Quarkus Dev Mode provides live reloading and Dev Services automatically starts a Postgres container without manual configuration, streamlining the development workflow.

#4about 3 minutes

Using an AI assistant to generate a JPA entity

The IntelliJ AI assistant generates a complete JPA entity class for a pet from a detailed text prompt, accelerating the initial data model creation.

#5about 4 minutes

Writing persistence layer tests with QuarkusTest

Persistence layer tests are created using the `@QuarkusTest` and `@TestTransaction` annotations, which manage the application context and ensure database changes are rolled back after each test.

#6about 1 minute

Implementing the Panache repository to pass tests

The repository layer is implemented using Quarkus Panache, which simplifies database queries and allows the previously written failing test to pass.

#7about 6 minutes

Mocking and testing the REST layer with Rest Assured

The REST API layer is tested by mocking the repository dependency with `@InjectMock` and using the Rest Assured library to verify HTTP responses and status codes.

#8about 2 minutes

Implementing the REST resource with AI assistance

An AI assistant generates the full Jakarta REST resource class based on the test suite, demonstrating how to implement code that satisfies a predefined set of tests.

#9about 3 minutes

Using virtual threads and the Quarkus Dev UI

Endpoints are switched to run on virtual threads using a simple annotation, and the Quarkus Dev UI is showcased as a tool for inspecting the database and other extensions live.

#10about 1 minute

Summary and resources for getting started with Quarkus

The session concludes by highlighting how quickly a fully tested application was built and points to the Quarkus superheroes demo for further learning.