How To Be a Java Automated Testing Superstar
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The document outlines the importance of automated testing in Java development, emphasizing how it enhances the CI/CD process, reduces deployment time, and improves code reliability. It provides practical advice on becoming proficient in automated testing, including treating test code like production code and utilizing tools like JUnit 5 and AssertJ. Additionally, it mentions techniques such as contract-driven development and the use of test containers to facilitate effective testing practices.
![• Parallel test execution
• Repeated tests
• Extensions
• Selective disabling
• Default test methods
• And more!
JUnit 5 Not Covered
[Date]
Copyright © 2021, Oracle and/or its affiliates | Confidential: Internal/Restricted/Highly Restricted
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How To Be a Java Automated Testing Superstar
- 1. How to Be a Java Automated Testing Superstar! Billy Korando Oracle - Java Developer Advocate ☕🥑 @BillyKorando
- 2. • Ask questions • Reach out: Twitter: @BillyKorando Email: [email protected] • Key link 👉 https://github.com/wkorando/java-testing-superstar Important Notes Copyright © 2021, Oracle and/or its affiliates 2
- 3. Copyright © 2021, Oracle and/or its affiliates 3 https://billykorando.com/
- 4. My code is perfect! Why should I waste time writing tests? Why Write Automated Tests? Copyright © 2021, Oracle and/or its affiliates 4 • Substantial time and effort to write tests • Substantial time and effort to maintain tests
- 5. 🏠 Why Write Automated Tests? Copyright © 2021, Oracle and/or its affiliates 5 CI/CD Process => 🧱🧱🧱🧱🧱🧱 🧱🧱🧱🧱🧱🧱🧱🧱 🧱🧱🧱🧱🧱🧱🧱🧱 Automated Tests =>
- 6. Deployment Process Copyright © 2021, Oracle and/or its affiliates 6 🌎 Deploy to Prod 👩💻🧑💻 👨💻 Developers Commit Code 🔨 Build & Test Code ✅✅ ✅ 🛴 Manual Process Takes hours or days
- 7. The code your code runs on The Dependency Iceberg Copyright © 2021, Oracle and/or its affiliates 7 Your Code { • Security patches • Performance enhancements • Feature enhancements
- 8. Manual Test Costs Copyright © 2021, Oracle and/or its affiliates 8 The high effort of regression testing code disincentivizes keeping dependencies up-to-date
- 9. Deployment Process Copyright © 2021, Oracle and/or its affiliates 9 🌎 Deploy to Prod 👩💻🧑💻 👨💻 Developers Commit Code 🔨 Build & Test Code ✅✅ ✅ 🏍 Automated Process Measured in minutes
- 10. Auditable 🕵 • Can review test code, reports, and logging Repeatable ↻ • Can re-run test suite to see if problems persists • Can run test suite against other code base/version to see if problem exists Additional Benefits Copyright © 2021, Oracle and/or its affiliates 10
- 11. Whatever gives you confidence to deploy to PROD without manual intervention How Many Automated Test Should I Write? Copyright © 2021, Oracle and/or its affiliates 11
- 12. Manual testing still needed. But it’s exploratory testing. Manual Testing Copyright © 2021, Oracle and/or its affiliates 12
- 13. How to be an Automated Testing Superstar? Copyright © 2021, Oracle and/or its affiliates 13
- 14. ✅ Treat Test Code like “Production” Code ✅ Write Human Readable Tests How to be an Automated Testing Superstar? Copyright © 2021, Oracle and/or its affiliates 14
- 15. • Parallel test execution • Repeated tests • Extensions • Selective disabling • Default test methods • And more! JUnit 5 Not Covered [Date] Copyright © 2021, Oracle and/or its affiliates | Confidential: Internal/Restricted/Highly Restricted 15
- 16. AssertJ – Fluent Assertions Copyright © 2021, Oracle and/or its affiliates 16
- 17. AssertJ – Fluent Assertions Copyright © 2021, Oracle and/or its affiliates 17
- 18. ✅ Write Reliable Tests How to be an Automated Testing Superstar? Copyright © 2021, Oracle and/or its affiliates 18
- 19. Test Containers Copyright © 2021, Oracle and/or its affiliates 19
- 20. Test Containers Copyright © 2021, Oracle and/or its affiliates 20 • Test against local containerized instances of remote services • Don’t have to worry about: • Service being down • Test data going missing • Maintain local instance
- 21. JFRUnit Copyright © 2021, Oracle and/or its affiliates 21
- 22. JFRUnit Copyright © 2021, Oracle and/or its affiliates 22 • Capture JDK Flight Recorder (JFR) Events to track system performance behavior • Check JVM behavior consistent across systems and environments
- 23. Contract Driven Development (Spring Cloud Contract) Copyright © 2021, Oracle and/or its affiliates 23
- 24. Contract Driven Development (Spring Cloud Contract) Copyright © 2021, Oracle and/or its affiliates 24 • Contracts validate service fulfill defined behavior • Contracts can be used to setup up mock of service
- 25. Junit 5, Mockito, AssertJ, and Test Containers: https://github.com/wkorando/welcome-to-junit5-v2 Spring Cloud Contract Example: https://github.com/wkorando/collaborative-contract-driven-development-2-0 JFRUnit: https://github.com/wkorando/testing-tuesday/tree/main/xxx-jfr-unit Code Examples Copyright © 2021, Oracle and/or its affiliates 25
- 26. Thank you 26 Copyright © 2021, Oracle and/or its affiliates