About the Primer

main branch:

This is the source code for the Primer online course, you'll find the source code for the Masterclass here.

Introduction

The Testing Spring Boot Applications Primer is a beginner-friendly course on testing your Spring Boot applications. You'll learn how to effectively write unit, integration, and end-to-end tests while utilizing Spring Boot's excellent test support.

Guided Introduction For Testing Real-World Spring Boot Applications
15 Course Lessons Covering Unit, Integration and End-to-End Testing
12 Hands-On Exercises Including a Final Assessment

TL;DR:

Getting started with testing Spring Boot applications
Learn more about the spring-boot-starter-test dependency
Write your first unit, integration and end-to-end test
Get familiar with common Java testing libraries: JUnit 5, Mockito, Testcontainers, Selenium, etc.

Enroll here for the Testing Spring Boot Applications Primer Online Course.

Further Resources and Links

Local Project Setup

Requirements

Mandatory requirements:

Java 21 (JDK flavour (OpenJDK/Azul/Oracle) does not matter). For the correct Java version setup I can recommend JEnv (Mac/Linux) and the Maven Toolchains Plugin (Windows)

$ java -version
openjdk version "21.0.2" 2024-01-16 LTS
OpenJDK Runtime Environment Temurin-21.0.2+13 (build 21.0.2+13-LTS)
OpenJDK 64-Bit Server VM Temurin-21.0.2+13 (build 21.0.2+13-LTS, mixed mode)

Docker Engine (Community Edition is enough):

$ docker version
Client: Docker Engine - Community
 Version:           20.10.6
 API version:       1.41
 Go version:        go1.13.15
 Git commit:        370c289
 Built:             Fri Apr  9 22:47:17 2021
 OS/Arch:           linux/amd64
 Context:           default
 Experimental:      true

Server: Docker Engine - Community
 Engine:
  Version:          20.10.6
  API version:      1.41 (minimum version 1.12)
  Go version:       go1.13.15
  Git commit:       8728dd2
  Built:            Fri Apr  9 22:45:28 2021
  OS/Arch:          linux/amd64
  Experimental:     false

Optional requirements:

Maven >= 3.6 (the project also includes the Maven Wrapper).

When using Maven from the command line, make sure ./mvnw -version reports the correct Java version:

$ ./mvnw -version

Apache Maven 3.8.4 (9b656c72d54e5bacbed989b64718c159fe39b537)
Maven home: /home/rieckpil/.m2/wrapper/dists/apache-maven-3.8.4-bin/52ccbt68d252mdldqsfsn03jlf/apache-maven-3.8.4
Java version: 17.0.1, vendor: Eclipse Adoptium, runtime: /usr/lib/jvm/jdk-17.0.1+12
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "5.4.0-92-generic", arch: "amd64", family: "unix"