Contract testing TestCon 2019
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Verifying Microservices in Chains without Chain Testing? In large companies we use large (production like) acceptance test environments to validate the system. These environments are not only often fragile but also expensive to maintain. Due to the popularity of micro services we deploy more often, which decreases the availability of these environments. What if we skip the acceptance test environment for releasing to production? Can we still guarantee the quality of our end to end chain? How do we know our new version is working, without verification in an end to end acceptance environment? In this interactive session you will learn how you can mitigate the risk not having an end to end acceptance environment by use of Consumer Driven Contracts (contract testing).
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Contract testing TestCon 2019
- 1. Verifying microservices in chains without chain testing? Pascal Dufour pascal@agilix.nl @pascal_dufour
- 2. Consumer Driven Contracts What do you know. 1 minute AgiliX @ TestCon Europe 2019
- 3. A) Statement 1: Discuss 2 minute with your neighbor B) Statement 1: Discuss 3 minute with a pair of neighbors C) Vote as a group Debrief &Take aways The plan for this “talk” AgiliX @ TestCon Europe 2019 The idea Repeat with statement 2 Repeat with statement 3 How did we get contract testing to work
- 4. Chain testing Backend payment Customer flow AgiliX @ TestCon Europe 2019 Backend Onboard customer Backend Buy product Backend … Frontend payment Frontend Onboard customer Frontend Buy product Frontend ….
- 5. AgiliX @ TestCon Europe 2019
- 6. AgiliX @ TestCon Europe 2019 Chain testing reality • The real thing • Visual tests • Business test • Realistic simulations • Connected to all external systems • ”All” user test are possible Positive • Test data (hell) • Never in sync (configuration) • Long run time • Difficult to debug • Late feedback • Too many dependencies • Operation costs • False sense of security Negative
- 7. The Idea? Address Producer GetAddress (PostalCode) Car GetAddress (PostalCode) Bike GetAddress (GPS coordinates) Drone A B C A’ D E Scenario’s Contracts : AgiliX @ TestCon Europe 2019
- 8. Definitions • Consumer Driven Contracts is a pattern that drives the development of the Producer from its Consumers point of view. • Producer Service that exposes an API / Sends an message • Consumer Service that consumes the the API of the producer /Send a request • Contract Agreement between consumer and producer what the API / message will look like. AgiliX @ TestCon Europe 2019
- 9. Which problems solves CDC • Late feedback from a changing API. • Producer design not fitting the expectation by consumers • Unclear expectation of the behavior of the API AgiliX @ TestCon Europe 2019
- 10. Microservices Is there for microservices a different test strategy? AgiliX @ TestCon Europe 2019 e 2 e Integration Unit
- 11. A) Statement 1: Discuss 2 minute with your neighbor B) Statement 1: Discuss 3 minute with a pair of neighbors C) Vote as a group Debrief &Take aways The plan for this “talk” AgiliX @ TestCon Europe 2019 The idea Repeat with statement 2 Repeat with statement 3 How did we get contract testing to work
- 12. AgiliX @ TestCon Europe 2019
- 13. CDC is only useful for testing the syntax max fieldlength, only nummeric, etc. AgiliX @ TestCon Europe 2019 Huh? / Really? / So?
- 14. Relations between dependent fields should be tested! When Tax amount is specified, Tax % might be required AgiliX @ TestCon Europe 2019 Huh? / Really? / So?
- 15. A CDC-test should always break when a contract is changed! AgiliX @ TestCon Europe 2019 Huh? / Really? / So?
- 16. Debrief • Consumer Driven Contracts is a pattern that drives the development of the Producer from its Consumers point of view. • Force communication • Formal • Documentation • Fast feedback during development AgiliX @ TestCon Europe 2019
- 17. How did we get it to work • No availability of the acceptance test environment (production like) anymore • A few determined enthusiastic developers • Setup pipelines / examples • Frequent Knowledge sessions • Mentoring others who where new. • Each teams monitor his own tests. • Review cross team AgiliX @ TestCon Europe 2019
- 18. Take aways • Consumer Driven Contracts is a pattern that drives the development of the Producer from its Consumers point of view. • Force communication • Fast feedback to the developer. • Producer design seen as black box (design should be tested by producer it self) • Determined enthusiastic developers • Data format like an IBAN number should be tested. • Contract should be extendable (adding additional fields by the producer should be possible.) • Stubs needed for the contract are useful elsewhere • The principle of CDC can be used outside micro services. AgiliX @ TestCon Europe 2019
- 19. Join Slido.com with #testcon2019 Thank you All slides can be download at http://Agilix.nl/ AgiliX @ TestCon Europe 2019
- 20. Links • Martin Fowler Consumer-Driven Contracts: A Service Evolution Pattern • Marcin Grzejszczak consumer driven contract • Spotify: Testing of Microservices Special thanks to Cirilo wortel Daan Koolman AgiliX @ TestCon Europe 2019
- 21. Pascal Dufour AgiliX @ TestCon Europe 2019 Getting a Grip on Exploratory Testing