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Domain Driven Testing: Know What You’re Doing

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Dmitry Vinnik

“I tested it how you told me to,” “Requirements say it's expected,” “I assumed it's fine” – these are the common phrases you hear when customer cases come up. Unfortunately, it is nothing unusual in our industry to be detached from customers' actual needs. As a result, teams regularly fail when they prioritize requirements over actual behaviour that the customers expect. This problem of misaligned teams' focus is where Domain Driven Testing (DDT) comes into play. DDT helps developers to put themselves into the customers' shoes and see the product for what it is. This prioritization of the actual behaviour over the mere following of the requirements is what defines Domain Driven Testing. In this talk, we discuss how knowledge of your company's domain (aka, the focus of your business) can improve your testing practices. We talk about Domain Driven Design techniques, Exploratory Testing, and other methods which emphasize software quality through customers' success. We touch bases on tools you can integrate into your system using Domain Driven Test Pyramid, and what common mistakes you should avoid when implementing Domain Driven Testing.

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Domain Driven Testing: Know What You’re Doing Dmitry Vinnik @DmitryVinnik dvinnik.com
What are our goals? @DmitryVinnik dvinnik.com
Goals Domain Driven Testing (DDT): What, Why, How and When DDT In Practice: Test Pyramid Finding Right Technique For Your Team @DmitryVinnik dvinnik.com
Where do we start? @DmitryVinnik dvinnik.com
Let’s start with the Title @DmitryVinnik dvinnik.com
Domain Driven Testing Know What You’re Doing @DmitryVinnik dvinnik.com
Domain Driven @DmitryVinnik dvinnik.com
Domain Driven … What? @DmitryVinnik dvinnik.com
Domain Driven Design @DmitryVinnik dvinnik.com
What is Design? @DmitryVinnik dvinnik.com
What is it good for? Patterns Modules Models @DmitryVinnik dvinnik.com
Is there a Problem? @DmitryVinnik dvinnik.com
Yes, there is! @DmitryVinnik dvinnik.com
Common Design Pitfalls One Size Fits All Design Stagnation No Design Evolution Dogmatism @DmitryVinnik dvinnik.com
How to Tackle? @DmitryVinnik dvinnik.com
Domain Driven Design @DmitryVinnik dvinnik.com
Common Design Pitfalls One Size Fits All Design Stagnation No Design Evolution Dogmatism @DmitryVinnik dvinnik.com
One Size Fits All Dogmatism One Size Fits All Dogmatism Design Stagnation No Design Evolution No Design Evolution Design Stagnation Domain Driven Design One Size Fits All Context Matters Dogmatism Design Guidance No Design Evolution Design Evolution Design Stagnation Design Lifetime Design Guidance Design Evolution Design Lifetime @DmitryVinnik dvinnik.com
Context Matters Ubiquitous Language Domain Segregation Bound Context Bound Context Domain Segregation @DmitryVinnik dvinnik.com
Context Matters: Ubiquitous Language @DmitryVinnik dvinnik.com
Ubiquitous Language Engineers Testers Domain Experts @DmitryVinnik dvinnik.com
Conclusion? @DmitryVinnik dvinnik.com
Communication is Essential in DDD @DmitryVinnik dvinnik.com
Context Matters Ubiquitous Language Domain Segregation Bound Context Bound Context Domain Segregation @DmitryVinnik dvinnik.com Ubiquitous Language Bound Context
Context Matters: Bound Context Linguistic Boundary Logical Boundary Physical Boundary@DmitryVinnik dvinnik.com
Context Matters Ubiquitous Language Domain Segregation Bound Context Bound Context Domain Segregation @DmitryVinnik dvinnik.com Ubiquitous Language Bound Context Bound Context Domain Segregation
Back to Core DDD @DmitryVinnik dvinnik.com
One Size Fits All Dogmatism One Size Fits All Dogmatism Design Stagnation No Design Evolution No Design Evolution Design Stagnation Domain Driven Design One Size Fits All Context Matters Dogmatism Design Guidance No Design Evolution Design Evolution Design Stagnation Design Lifetime Design Guidance Design Evolution Design Lifetime @DmitryVinnik dvinnik.com Context Matters Design Guidance
Design Guidance Context Mapping Minimalism Design by Contract Minimalism Design by Contract @DmitryVinnik dvinnik.com
Context Map, Martin Fowler Context Map Example @DmitryVinnik dvinnik.com
Design Guidance: Context Mapping Documentation Communication Current State @DmitryVinnik dvinnik.com
Galactic Modeling Language Box Line Label @DmitryVinnik dvinnik.com
Context Map, Martin Fowler Context Map Example @DmitryVinnik dvinnik.com
Design Guidance Context Mapping Minimalism Design by Contract Context Mapping Minimalism Design by Contract Context Mapping Context Mapping MinimalismMinimalism Design by Contract @DmitryVinnik dvinnik.com
Design Guidance: Design by Contract @DmitryVinnik dvinnik.com
“Require No More, Promise No Less” Quote from Bertrand Meyer, “Design by Contract” @DmitryVinnik dvinnik.com
Design by Contract @DmitryVinnik dvinnik.com
One Size Fits All Dogmatism One Size Fits All Dogmatism Design Stagnation No Design Evolution No Design Evolution Design Stagnation Domain Driven Design One Size Fits All Context Matters Dogmatism Design Guidance No Design Evolution Design Evolution Design Stagnation Design Lifetime Design Guidance Design Evolution Design Lifetime @DmitryVinnik dvinnik.com Context Matters Design Guidance Design Guidance Design Evolution
Design Evolution Strategic Decisions Supple Design Strategic Decisions @DmitryVinnik dvinnik.com
Design Evolution: Supple Design Declarative Design Domain Specific Languages Immutable Operations @DmitryVinnik dvinnik.com
Domain Specific Languages ↑ Readability Ubiquitous Language Tailored to Domain @DmitryVinnik dvinnik.com
Design Evolution Strategic Decisions Supple Design Strategic Decisions Supple Design Strategic Decisions @DmitryVinnik dvinnik.com
Design Evolution: Strategic Decisions Team Collaboration Absorbing Feedback Experience Diversity@DmitryVinnik dvinnik.com
One Size Fits All Dogmatism One Size Fits All Dogmatism Design Stagnation No Design Evolution No Design Evolution Design Stagnation Domain Driven Design One Size Fits All Context Matters Dogmatism Design Guidance No Design Evolution Design Evolution Design Stagnation Design Lifetime Design Guidance Design Evolution Design Lifetime @DmitryVinnik dvinnik.com Context Matters Design Guidance Design Guidance Design Evolution Design Evolution Design Lifetime
Design Lifetime: Expiration Date @DmitryVinnik dvinnik.com
10 years Expiration Date 2003 2013 @DmitryVinnik dvinnik.com
One Size Fits All Dogmatism One Size Fits All Dogmatism Design Stagnation No Design Evolution No Design Evolution Design Stagnation Domain Driven Design One Size Fits All Context Matters Dogmatism Design Guidance No Design Evolution Design Evolution Design Stagnation Design Lifetime Design Guidance Design Evolution Design Lifetime @DmitryVinnik dvinnik.com Context Matters Design Guidance Design Guidance Design Evolution Design Evolution Design Lifetime Design Lifetime Context Matters Design Guidance Design Evolution Design Lifetime
Let’s Step Back @DmitryVinnik dvinnik.com
Domain Driven Testing Know What You’re Doing @DmitryVinnik dvinnik.com
Domain Driven Testing Know What You’re Doing @DmitryVinnik dvinnik.com
Domain Driven Testing Know What You’re Doing @DmitryVinnik dvinnik.com
Domain Driven Testing as Design Principle @DmitryVinnik dvinnik.com
Looking back at DDD @DmitryVinnik dvinnik.com
Domain Driven Design Bound Context Context Mapping Ubiquitous Language @DmitryVinnik dvinnik.com
Domain Driven Testing Bound Context Context Mapping Ubiquitous Language Context Mapping Bound Context Ubiquitous Language Context Mapping Test Plan @DmitryVinnik dvinnik.com
Domain Driven Testing: Context Mapping @DmitryVinnik dvinnik.com
Domain Driven Testing: Test Plan @DmitryVinnik dvinnik.com
Context Map, Martin Fowler Context Map Example @DmitryVinnik dvinnik.com
Domain Driven Testing Bound Context Context Mapping Ubiquitous Language Context Mapping Bound Context Ubiquitous Language Context Mapping Test PlanTest Plan Bound Context Test Structure @DmitryVinnik dvinnik.com
Domain Driven Testing: Bound Context @DmitryVinnik dvinnik.com
Domain Driven Testing: Test Structure @DmitryVinnik dvinnik.com
Production Entities Test Entities @DmitryVinnik dvinnik.com
Domain Driven Testing Bound Context Context Mapping Ubiquitous Language Context Mapping Bound Context Ubiquitous Language Context Mapping Test PlanTest Plan Bound Context Test Structure Ubiquitous Language Test Structure Test Cases @DmitryVinnik dvinnik.com
Domain Driven Testing: Ubiquitous Language @DmitryVinnik dvinnik.com
Domain Driven Testing: Test Cases @DmitryVinnik dvinnik.com
Enough Theory! @DmitryVinnik dvinnik.com
Let’s get more Practice @DmitryVinnik dvinnik.com
How do we usually test? @DmitryVinnik dvinnik.com
Test Pyramid ↑ Fidelity ↓ Speed ↑ Cost ↓ Fidelity ↑ Speed ↓ Cost @DmitryVinnik dvinnik.com
Let’s Put DDD Spin on It @DmitryVinnik dvinnik.com
Test Pyramid @DmitryVinnik dvinnik.com
↑ Fidelity ↓ Speed ↑ Cost ↓ Fidelity ↑ Speed ↓ Cost DDD Test Pyramid @DmitryVinnik dvinnik.com
Domain Enforcing Unit Tests Tests as Auditor Last Day Style Invariants Approval Testing @DmitryVinnik dvinnik.com
What is Approval Testing? @DmitryVinnik dvinnik.com
Approval Testing ↑ Fidelity Requirements Driven Evolving Validation ↑ Cost @DmitryVinnik dvinnik.com
Back to Domain Enforcing Unit Tests @DmitryVinnik dvinnik.com
Invariants Approval Testing Property Based Testing Schema Based Testing QuickTheory Schema Based Testing JSON Schema Validator JSON Schema Validator @DmitryVinnik dvinnik.com
QuickTheory @DmitryVinnik dvinnik.com
DDD Test Pyramid ↓ Fidelity ↑ Speed ↓ Cost @DmitryVinnik dvinnik.com
Component Approval Testing Text Based Testing Visual Testing Snapshot Testing TextTest Snapshot Testing Snapshot Testing Visual Testing Jest Visual Testing Applitools TextTest Jest BackstopJ S@DmitryVinnik dvinnik.com
BackstopJS
DDD Test Pyramid ↑ Fidelity ↓ Speed ↑ Cost ↓ Fidelity ↑ Speed ↓ Cost @DmitryVinnik dvinnik.com
End-to-End Task Testing @DmitryVinnik dvinnik.com
User Centric Testing Interactions Tasks Page Object Model Screenplay Pattern @DmitryVinnik dvinnik.com
Conclusion @DmitryVinnik dvinnik.com
Focus on User Dimension @DmitryVinnik dvinnik.com
User Dimensions Web User Client Side API User Server Side Protractor RestAssured @DmitryVinnik dvinnik.com
Protractor with Cucumber @DmitryVinnik dvinnik.com
DDD Test Pyramid ↑ Fidelity ↓ Speed ↑ Cost ↓ Fidelity ↑ Speed ↓ Cost @DmitryVinnik dvinnik.com
How to find flaws in DDT? @DmitryVinnik dvinnik.com
Experiment! @DmitryVinnik dvinnik.com
Domain Breakers Outsiders Exploratory Testing Chaos Testing Fuzzing Testing @DmitryVinnik dvinnik.com
Bringing it all together @DmitryVinnik dvinnik.com
There is a place for Design in Testing! @DmitryVinnik dvinnik.com
Place for Domain Driven Design @DmitryVinnik dvinnik.com
Call For Action Evaluate Test Architecture Create Context Boundaries Unify Test Strategy Experiment! @DmitryVinnik dvinnik.com
Q/A @DmitryVinnik dvinnik.com
About Speaker Twitter: @DmitryVinnik Blog: dvinnik.com LinkedIn: in/dmitry-vinnik/ Email: dmitry@dvinnik.com

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Domain Driven Testing: Know What You’re Doing

Editor's Notes

  1. Design perspective, not testing DDD application
  2. https://www.slideshare.net/syedmuhammadhammad/software-design-13430869
  3. https://www.slideshare.net/syedmuhammadhammad/software-design-13430869
  4. One size fits all,
  5. One size fits all,
  6. One size fits all,
  7. Conway’s law Opera -> not going to dance
  8. Example???
  9. Example???
  10. Example???
  11. Example???
  12. Logical - Layered architecture (app, domain, infra) Physical - Microservice
  13. Example: Startup with Mobile vs. Web
  14. One size fits all,
  15. Example???
  16. Source: https://martinfowler.com/bliki/BoundedContext.html
  17. Design is the code, the code is design Big ball of mud, make it visibl
  18. According to Kent Beck (http://wiki.c2.com/?GalacticModelingLanguage)
  19. Source: https://martinfowler.com/bliki/BoundedContext.html
  20. Example???
  21. One size fits all,
  22. Example???
  23. Design is the code, the code is design
  24. DSL Examples: CSS, HTML
  25. Example???
  26. Working with Domain Experts, Testers, Developers Really get and use the feedback from every stackholder Try to have engineers of all levels, of all backgrounds (atomic missles)
  27. One size fits all,
  28. Layer Design -> Hexagonal design and SOA Emotionally attached to software (kill your darlings -) References: https://www.amazon.com/Domain-Driven-Design-Tackling-Complexity-Software/dp/0321125215 https://www.amazon.com/Implementing-Domain-Driven-Design-Vaughn-Vernon/dp/0321834577/ref=pd_sim_14_2/146-5573393-8712768?_encoding=UTF8&pd_rd_i=0321834577&pd_rd_r=0HHESFRXFB5RETT0N0G9&pd_rd_w=V0P7D&pd_rd_wg=OozwD&psc=1&refRID=0HHESFRXFB5RETT0N0G9
  29. Layer Design -> Hexagonal design and SOA Emotionally attached to software (kill your darlings -) References: https://www.amazon.com/Domain-Driven-Design-Tackling-Complexity-Software/dp/0321125215 https://www.amazon.com/Implementing-Domain-Driven-Design-Vaughn-Vernon/dp/0321834577/ref=pd_sim_14_2/146-5573393-8712768?_encoding=UTF8&pd_rd_i=0321834577&pd_rd_r=0HHESFRXFB5RETT0N0G9&pd_rd_w=V0P7D&pd_rd_wg=OozwD&psc=1&refRID=0HHESFRXFB5RETT0N0G9
  30. One size fits all,
  31. Requirements
  32. Requirements
  33. Requirements
  34. Source: https://martinfowler.com/bliki/BoundedContext.html
  35. Requirements
  36. Requirements
  37. Explain width is #tests
  38. Explain width is #tests Think Acceptance Tests !Exploratory tests under breaker
  39. Explain width is #tests Think Acceptance Tests !Exploratory tests under breaker
  40. Bug is not a bug situation Not upfront Tackling blindness
  41. Bug is not a bug situation Not upfront Tackling blindness
  42. Design by Contract
  43. Design by Contract
  44. Example - how many hours of netflix Text test Diffy Json schema validator
  45. Explain width is #tests Think Acceptance Tests !Exploratory tests under breaker
  46. Explain width is #tests Think Acceptance Tests !Exploratory tests under breaker
  47. Possibly talk about screenplay vs interation, explain why task SOLID pattern
  48. Possibly talk about screenplay vs interation, explain why task SOLID pattern
  49. Explain width is #tests Think Acceptance Tests !Exploratory tests under breaker
  50. New Hires (point about multiple backgrounds people) Great book Explore It by
  51. Will be sharing slides, github and useful links