Steps to run this project:

1. Clone this Git repository

2. Navigate to the folder spring-boot-integration-tests-wiremock

3. Run mvn verify to execute the integration tests on your machine

4. Intro to the project and WireMock

• quick inspect of the code (uses Spring Boot, but the idea and this testing recipe can be used as an inspiration for other frameworks/setups)
• backend API that delegates to an HTTP client to call a remote system
• explain downsides of using the remote system during IT (depends on the uptime, additional load, create costs, modify states) with a nice-looking diagram
• WireMock helps here as we can start a local Jetty and mock HTTP responses
• This also helps to test error scenarios like 5xx or slow responses
• Outline upcoming parts: more insights to WireMock, JUnit 5 and JUnit 4 setup
• we'll start with a manual setup
• show first simple test

2. WireMock features

• build on top of the existing tests
• show request matching capability
• explain priority of multiple requests
• reset the request stubs after ech tests
• request matching error in console
• get access to the recorded requests

3. JUnit 5 setup

• no JUnit Jupiter extension available from WireMock
• community examples (show the two most common)
  • wiremock/wiremock#684
  • https://github.com/JensPiegsa/wiremock-extension
  • https://github.com/phxql/wiremock-junit5
  • https://github.com/lanwen/wiremock-junit5
• we could also write our own
• alternative that nicely integrates with Spring is a ApplicationContextInitializer

4. JUnit 4 setup

• official rule
• still showcase it because there a lot of projects that haven't migrated yet
• caveats of JUnit 4 vs. JUnit 5 in the same project