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6-29-23 - [DevNation] - Avoiding common pitfall...

6-29-23 - [DevNation] - Avoiding common pitfalls with modern microservices testing

Have you ever wondered why your microservices break in production after all the tests have passed during CI/CD? Have you ever wondered if you’re testing too much or too little? If you want to learn about common pitfalls and how to catch them at build time rather than at runtime, this session is for you!

In this session, I’ll share some common battle scars from my experiences in the field. Additionally, I will introduce the testing pyramid and explain why it is important in helping to continuously deploy microservices independently without fear. I will demonstrate, through a test-driven development approach, how the combination of Pact contract testing combined with Quarkus developer joy can help prevent your microservices from breaking in production.

Eric Deandrea

June 22, 2023
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  1. Eric Deandrea Sr. Principal Developer Advocate Red Hat @edeandrea Avoiding

    common pitfalls with modern microservices testing Drawings courtesy of Holly Cummins
  2. @edeandrea #RedHat #DevNation Disclaimer! I am not a tester. (or

    even test expert) That’s ok– testing is every developer’s job!
  3. @edeandrea #RedHat #DevNation Netflix microservice architecture Testing with microservices is

    easy! My services are so small! Everything is decoupled! But….. If you only test the points, And not the lines…. Does the thing actually work?
  4. @edeandrea #RedHat #DevNation “It is all that is left unsaid

    upon which tragedies are built.” - Kreia, Star Wars Knights of the Old Republic II: The Sith Lords
  5. @edeandrea #RedHat #DevNation “You lied to me. How many other

    lies have I been told by the Council? And how do you know that you even have the truth?” – Anakin Skywalker
  6. @edeandrea #RedHat #DevNation “Many of the truths that we cling

    to depend on our viewpoint.” — Obi-Wan Kenobi, Return of the Jedi
  7. end-to-end tests unit tests integration tests low effort high realism

    tests with application server test REST endpoints tests with a database
  8. @edeandrea #RedHat #DevNation our mock our code ✔ tests ✘

    reality our code their actual code Why mocks aren’t enough
  9. @edeandrea #RedHat #DevNation “Will someone get this big walking carpet

    out of my way?” – Princess Leia Demo The limitations of unit tests https://github.com/edeandrea/pact-quarkus-wookie-carpet-demo
  10. @edeandrea #RedHat #DevNation “Will someone get this big walking carpet

    out of my way?” – Princess Leia Demo The limitations of unit tests https://github.com/edeandrea/pact-quarkus-wookie-carpet-demo
  11. @edeandrea #RedHat #DevNation ✔ our tests ✔ their tests ✔

    reality our code their code contract test mock functional test A better mock
  12. @edeandrea #RedHat #DevNation ✔ our tests ✘ their tests ✘

    reality our code their code contract test mock functional test A better mock
  13. @edeandrea #RedHat #DevNation ✘ our tests ✔ their tests ✘

    reality A better mock our code their code contract test mock functional test
  14. @edeandrea #RedHat #DevNation contract consumer tests mock declare (Pact) Pact

    file Consumer-driven contract testing Spring Cloud Contract Pact
  15. @edeandrea #RedHat #DevNation contract consumer tests provider mock declare (Pact)

    contract tests verify Pact file Consumer-driven contract testing Spring Cloud Contract Pact Pact
  16. @edeandrea #RedHat #DevNation contract consumer tests provider mock declare (Pact)

    contract tests verify Pact file Consumer-driven contract testing ☑ rich semantic testing Spring Cloud Contract Pact Pact
  17. @edeandrea #RedHat #DevNation contract consumer tests provider mock declare (Pact)

    contract tests verify Pact file Consumer-driven contract testing ☑ rich semantic testing ☑ provider can ‘develop to the contract’ instead of developing speculatively (TDD) Spring Cloud Contract Pact Pact
  18. @edeandrea #RedHat #DevNation contract consumer tests provider mock declare (Pact)

    contract tests verify Pact file Consumer-driven contract testing ☑ rich semantic testing ☑ provider can ‘develop to the contract’ instead of developing speculatively (TDD) ⛔ existing spec assets cannot be re-purposed Spring Cloud Contract Pact Pact
  19. @edeandrea #RedHat #DevNation contract consumer tests provider mock declare (Pact)

    contract tests verify Pact file Consumer-driven contract testing ☑ rich semantic testing ☑ provider can ‘develop to the contract’ instead of developing speculatively (TDD) ⛔ existing spec assets cannot be re-purposed ⛔ provider needs to know who consumers are Spring Cloud Contract Pact Pact
  20. @edeandrea #RedHat #DevNation contract consumer tests provider mock declare (Pact)

    contract tests verify Pact file Consumer-driven contract testing ☑ rich semantic testing ☑ provider can ‘develop to the contract’ instead of developing speculatively (TDD) ⛔ existing spec assets cannot be re-purposed ⛔ provider needs to know who consumers are ⛔ consumers can break provider CI Spring Cloud Contract Pact Pact
  21. @edeandrea #RedHat #DevNation contract consumer provider OpenAPI Provider-driven contract testing

    generate (OpenAPI snapshot of current implementation) other protocol specs
  22. @edeandrea #RedHat #DevNation contract consumer provider contract tests verify OpenAPI

    Provider-driven contract testing generate (OpenAPI snapshot of current implementation) other protocol specs Schemathesis Microcks
  23. @edeandrea #RedHat #DevNation contract consumer tests provider mock contract tests

    verify OpenAPI Provider-driven contract testing generate (OpenAPI snapshot of current implementation) other protocol specs Prism Microcks Schemathesis Microcks
  24. @edeandrea #RedHat #DevNation contract consumer tests provider mock contract tests

    verify OpenAPI Provider-driven contract testing generate (OpenAPI snapshot of current implementation) other protocol specs ☑ familiar contract format Prism Microcks Schemathesis Microcks
  25. @edeandrea #RedHat #DevNation contract consumer tests provider mock contract tests

    verify OpenAPI Provider-driven contract testing generate (OpenAPI snapshot of current implementation) other protocol specs ☑ familiar contract format ☑ provider does not need comms with consumers Prism Microcks Schemathesis Microcks
  26. @edeandrea #RedHat #DevNation contract consumer tests provider mock contract tests

    verify OpenAPI Provider-driven contract testing generate (OpenAPI snapshot of current implementation) other protocol specs ☑ familiar contract format ☑ provider does not need comms with consumers ⛔ provider does not get insight into how API is being used (deprecation is harder) Prism Microcks Schemathesis Microcks
  27. @edeandrea #RedHat #DevNation contract consumer tests provider mock contract tests

    verify OpenAPI Provider-driven contract testing generate (OpenAPI snapshot of current implementation) other protocol specs ☑ familiar contract format ☑ provider does not need comms with consumers ⛔ provider does not get insight into how API is being used (deprecation is harder) ⛔ spec-based tests lack functional depth Prism Microcks Schemathesis Microcks
  28. @edeandrea #RedHat #DevNation Is OpenAPI enough? It has the same

    syntax, but the semantics are different.
  29. @edeandrea #RedHat #DevNation Is OpenAPI enough? It has the same

    syntax, but the semantics are different. It looks the same, but the behaviour is different.
  30. @edeandrea #RedHat #DevNation Is OpenAPI enough? It has the same

    syntax, but the semantics are different. It looks the same, but the behaviour is different. Looks like a storm trooper. Behaves like Luke. (because it it is Luke)
  31. @edeandrea #RedHat #DevNation soo … microservices testing is hard limit

    end-to-end testing mocks will not be enough contract testing can rescue you
  32. @edeandrea #RedHat #DevNation Kubernetes Native Java with Quarkus Deployment Developer

    Joy • Quickly & easily build Kubernetes-Native Java applications • Industry leader in startup time and memory utilization for native and JVM applications • One step native executable generation • Leverage existing Java, Jakarta, MicroProfile, & Spring expertise • Imperative & reactive APIs side-by-side • Live coding with zero config https://www.infoq.com/articles/native-java-quarkus