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MicroShed Testing

A
Andrew Guibert

The document discusses the importance of automated testing and integration testing using Testcontainers to enhance developer confidence in applications. It highlights the benefits of using containers for easier setup and true-to-production tests, while also addressing common challenges developers face with tests. Additionally, it mentions the concept of the twelve-factor app and how best practices can be implemented to improve testing and deployment processes.

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Streamline Integration Testing with Testcontainers — Andrew Guibert Software Engineer IBM @andrew_guibert
Why do we write automated tests? EclipseCon EU 2019 | © 2019 IBM Corporation 2@andrew_guibert
Why do we write automated tests? To have confidence that our application works the way we want it to. EclipseCon EU 2019 | © 2019 IBM Corporation 3@andrew_guibert
What type of testing gives us the most confidence? EclipseCon EU 2019 | © 2019 IBM Corporation 4 Source: If applicable, describe source origin System/UI Testing Unit Testing Integration Testing @andrew_guibert
EclipseCon EU 2019 | © 2019 IBM Corporation 5 Which type of tests contribute more to your confidence in your automated tests? Unit/Mock tests 24% Integration (i.e. "live server") tests 76% @andrew_guibert
4/4 Unit Tests Passing Faucet turns on Faucet turns off Drain works Sink does not overflow © 2019 IBM Corporation EclipseCon EU 2019 | © 2019 IBM Corporation @andrew_guibert
What we have time to do EclipseCon EU 2019 | © 2019 IBM Corporation 7 Source: If applicable, describe source origin Unit Testing Integration Testing Manual testing if I remember and am not swamped @andrew_guibert
The dilemma of testing Confidence Time given © 2019 IBM Corporation EclipseCon EU 2019 | © 2019 IBM Corporation @andrew_guibert
The dilemma of testing Confidence Time given Confidence level in tests © 2019 IBM Corporation EclipseCon EU 2019 | © 2019 IBM Corporation @andrew_guibert
The dilemma of testing Confidence Time given Confidence level in tests EclipseCon EU 2019 | © 2019 IBM Corporation @andrew_guibert
MicroShed Testing
The Twelve-Factor App EclipseCon EU 2019 | © 2019 IBM Corporation 12 VII. Port Binding VIII.Concurrency IX. Disposability X. Dev-Prod Parity XI. Logs XII. Admin Processes I. Codebase II. Dependencies III. Config IV. Backing Services V. Build, Release, Run VI. Stateless Processes @andrew_guibert
The Twelve-Factor App EclipseCon EU 2019 | © 2019 IBM Corporation 13 VII. Port Binding VIII.Concurrency IX. Disposability X. Dev-Prod Parity XI. Logs XII. Admin Processes I. Codebase II. Dependencies III. Config IV. Backing Services V. Build, Release, Run VI. Stateless Processes @andrew_guibert
Dev-Prod Parity EclipseCon EU 2019 | © 2019 IBM Corporation 14 Keep development, staging, and production as similar as possible Comprised of three common issues: – The time gap – The personnel gap – The tools gap @andrew_guibert
“The twelve-factor developer resists the urge to use different backing services between development and production, even when adapters theoretically abstract away any differences in backing services.” EclipseCon EU 2019 | © 2019 IBM Corporation 15 Dev-Prod Parity @andrew_guibert
It works on my machine. EclipseCon EU 2019 | © 2019 IBM Corporation 16 @andrew_guibert
Can you spot what’s wrong here? EclipseCon EU 2019 | © 2019 IBM Corporation @andrew_guibert
Can you spot what’s wrong here? EclipseCon EU 2019 | © 2019 IBM Corporation @andrew_guibert
Testing with databases EclipseCon EU 2019 | © 2019 IBM Corporation @andrew_guibert
EclipseCon EU 2019 | © 2019 IBM Corporation 20 Why do we do this? • Easy to set up • Faster than the real thing • Been doing it this way for >10 years @andrew_guibert
EclipseCon EU 2019 | © 2019 IBM Corporation 21 Containers • Combines everything needed to run a service into a single unit • Standard way to manage • Lightweight and disposable • Typically configured via env @andrew_guibert
MicroShed Testing
What it looks like EclipseCon EU 2019 | © 2019 IBM Corporation @andrew_guibert
Using Testcontainers EclipseCon EU 2019 | © 2019 IBM Corporation 24 • Databases • Messaging Brokers • External Services • Anything in a container @andrew_guibert
Taking things a step further EclipseCon EU 2019 | © 2019 IBM Corporation @andrew_guibert
Motivation Devs lack confidence in their tests because… • Tests do not reflect prod • Writing tests takes too long • Setup is too complex 11 11 10 7 18 9 0 10 20 WRITING TESTS IS TOO COMPLICATED OR TIME… OUR APP IS TOO BIG/COMPLEX TO TEST RUNNING THE TESTS WE HAVE TAKES TOO LONG DEBUGGING A TEST THAT FAILS TAKES TOO LONG THE TESTS WE HAVE DO NOT ACCURATELY REPRESENT HOW… SETTING UP OR CONFIGURING TESTS IS TOO COMPLICATED What factors are limiting the confidence in your automated tests? EclipseCon EU 2019 | © 2019 IBM Corporation @andrew_guibert
1) Easy to set up 2) Works with • Java EE • Jakarta EE • MicroProfile 3) Provide true-to- production tests MicroShed Testing EclipseCon EU 2019 | © 2019 IBM Corporation 27 @andrew_guibert
MicroShed Testing Test client JVM Docker network * App container App container App containerOther container resources (e.g. DB) User test code MicroShed Testing Testcontainers docker-java Convenience libs (e.g. REST client) controls * May be on different machine from test client Test request/responses @andrew_guibert
Example Application EclipseCon EU 2019 | © 2019 IBM Corporation @andrew_guibert
What it looks like EclipseCon EU 2019 | © 2019 IBM Corporation @andrew_guibert
Automatically discover, build, and start services EclipseCon EU 2019 | © 2019 IBM Corporation 31 a) Provide container label b) Locate Dockerfile c) Use default image @andrew_guibert
Wait for app container to be ready EclipseCon EU 2019 | © 2019 IBM Corporation 32 • Defaults to app context root • Can use MP Health 2.0 readiness check • Can supply path manually @andrew_guibert
Inject REST client EclipseCon EU 2019 | © 2019 IBM Corporation 33 • Can re-use class from app • Can define own client • Automatically configured for app container @andrew_guibert
Drive requests on running app container EclipseCon EU 2019 | © 2019 IBM Corporation 34 • Real HTTP requests • Parameters and return values converted with JSON-B • JWT tokens applied automatically @andrew_guibert
Where to learn more EclipseCon EU 2019 | © 2019 IBM Corporation 35 Testcontainers – testcontainers.org – github.com/testcontainers/testcontai ners-java MicroShed – microshed.org/microshed-testing/ – github.com/MicroShed/microshed- testing Demo Used – github.com/aguibert/oc1-demo Andrew Guibert @andrew_guibert @aguibert @andrew_guibert
36

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Ad

MicroShed Testing

  • 1. Streamline Integration Testing with Testcontainers — Andrew Guibert Software Engineer IBM @andrew_guibert
  • 2. Why do we write automated tests? EclipseCon EU 2019 | © 2019 IBM Corporation 2@andrew_guibert
  • 3. Why do we write automated tests? To have confidence that our application works the way we want it to. EclipseCon EU 2019 | © 2019 IBM Corporation 3@andrew_guibert
  • 4. What type of testing gives us the most confidence? EclipseCon EU 2019 | © 2019 IBM Corporation 4 Source: If applicable, describe source origin System/UI Testing Unit Testing Integration Testing @andrew_guibert
  • 5. EclipseCon EU 2019 | © 2019 IBM Corporation 5 Which type of tests contribute more to your confidence in your automated tests? Unit/Mock tests 24% Integration (i.e. "live server") tests 76% @andrew_guibert
  • 6. 4/4 Unit Tests Passing Faucet turns on Faucet turns off Drain works Sink does not overflow © 2019 IBM Corporation EclipseCon EU 2019 | © 2019 IBM Corporation @andrew_guibert
  • 7. What we have time to do EclipseCon EU 2019 | © 2019 IBM Corporation 7 Source: If applicable, describe source origin Unit Testing Integration Testing Manual testing if I remember and am not swamped @andrew_guibert
  • 8. The dilemma of testing Confidence Time given © 2019 IBM Corporation EclipseCon EU 2019 | © 2019 IBM Corporation @andrew_guibert
  • 9. The dilemma of testing Confidence Time given Confidence level in tests © 2019 IBM Corporation EclipseCon EU 2019 | © 2019 IBM Corporation @andrew_guibert
  • 10. The dilemma of testing Confidence Time given Confidence level in tests EclipseCon EU 2019 | © 2019 IBM Corporation @andrew_guibert
  • 12. The Twelve-Factor App EclipseCon EU 2019 | © 2019 IBM Corporation 12 VII. Port Binding VIII.Concurrency IX. Disposability X. Dev-Prod Parity XI. Logs XII. Admin Processes I. Codebase II. Dependencies III. Config IV. Backing Services V. Build, Release, Run VI. Stateless Processes @andrew_guibert
  • 13. The Twelve-Factor App EclipseCon EU 2019 | © 2019 IBM Corporation 13 VII. Port Binding VIII.Concurrency IX. Disposability X. Dev-Prod Parity XI. Logs XII. Admin Processes I. Codebase II. Dependencies III. Config IV. Backing Services V. Build, Release, Run VI. Stateless Processes @andrew_guibert
  • 14. Dev-Prod Parity EclipseCon EU 2019 | © 2019 IBM Corporation 14 Keep development, staging, and production as similar as possible Comprised of three common issues: – The time gap – The personnel gap – The tools gap @andrew_guibert
  • 15. “The twelve-factor developer resists the urge to use different backing services between development and production, even when adapters theoretically abstract away any differences in backing services.” EclipseCon EU 2019 | © 2019 IBM Corporation 15 Dev-Prod Parity @andrew_guibert
  • 16. It works on my machine. EclipseCon EU 2019 | © 2019 IBM Corporation 16 @andrew_guibert
  • 17. Can you spot what’s wrong here? EclipseCon EU 2019 | © 2019 IBM Corporation @andrew_guibert
  • 18. Can you spot what’s wrong here? EclipseCon EU 2019 | © 2019 IBM Corporation @andrew_guibert
  • 19. Testing with databases EclipseCon EU 2019 | © 2019 IBM Corporation @andrew_guibert
  • 20. EclipseCon EU 2019 | © 2019 IBM Corporation 20 Why do we do this? • Easy to set up • Faster than the real thing • Been doing it this way for >10 years @andrew_guibert
  • 21. EclipseCon EU 2019 | © 2019 IBM Corporation 21 Containers • Combines everything needed to run a service into a single unit • Standard way to manage • Lightweight and disposable • Typically configured via env @andrew_guibert
  • 23. What it looks like EclipseCon EU 2019 | © 2019 IBM Corporation @andrew_guibert
  • 24. Using Testcontainers EclipseCon EU 2019 | © 2019 IBM Corporation 24 • Databases • Messaging Brokers • External Services • Anything in a container @andrew_guibert
  • 25. Taking things a step further EclipseCon EU 2019 | © 2019 IBM Corporation @andrew_guibert
  • 26. Motivation Devs lack confidence in their tests because… • Tests do not reflect prod • Writing tests takes too long • Setup is too complex 11 11 10 7 18 9 0 10 20 WRITING TESTS IS TOO COMPLICATED OR TIME… OUR APP IS TOO BIG/COMPLEX TO TEST RUNNING THE TESTS WE HAVE TAKES TOO LONG DEBUGGING A TEST THAT FAILS TAKES TOO LONG THE TESTS WE HAVE DO NOT ACCURATELY REPRESENT HOW… SETTING UP OR CONFIGURING TESTS IS TOO COMPLICATED What factors are limiting the confidence in your automated tests? EclipseCon EU 2019 | © 2019 IBM Corporation @andrew_guibert
  • 27. 1) Easy to set up 2) Works with • Java EE • Jakarta EE • MicroProfile 3) Provide true-to- production tests MicroShed Testing EclipseCon EU 2019 | © 2019 IBM Corporation 27 @andrew_guibert
  • 28. MicroShed Testing Test client JVM Docker network * App container App container App containerOther container resources (e.g. DB) User test code MicroShed Testing Testcontainers docker-java Convenience libs (e.g. REST client) controls * May be on different machine from test client Test request/responses @andrew_guibert
  • 29. Example Application EclipseCon EU 2019 | © 2019 IBM Corporation @andrew_guibert
  • 30. What it looks like EclipseCon EU 2019 | © 2019 IBM Corporation @andrew_guibert
  • 31. Automatically discover, build, and start services EclipseCon EU 2019 | © 2019 IBM Corporation 31 a) Provide container label b) Locate Dockerfile c) Use default image @andrew_guibert
  • 32. Wait for app container to be ready EclipseCon EU 2019 | © 2019 IBM Corporation 32 • Defaults to app context root • Can use MP Health 2.0 readiness check • Can supply path manually @andrew_guibert
  • 33. Inject REST client EclipseCon EU 2019 | © 2019 IBM Corporation 33 • Can re-use class from app • Can define own client • Automatically configured for app container @andrew_guibert
  • 34. Drive requests on running app container EclipseCon EU 2019 | © 2019 IBM Corporation 34 • Real HTTP requests • Parameters and return values converted with JSON-B • JWT tokens applied automatically @andrew_guibert
  • 35. Where to learn more EclipseCon EU 2019 | © 2019 IBM Corporation 35 Testcontainers – testcontainers.org – github.com/testcontainers/testcontai ners-java MicroShed – microshed.org/microshed-testing/ – github.com/MicroShed/microshed- testing Demo Used – github.com/aguibert/oc1-demo Andrew Guibert @andrew_guibert @aguibert @andrew_guibert
  • 36. 36