Test Automation Strategy for Legacy System.

Transcript

1. Test Automation Strategy Artur Basak for Legacy System
2. 2 Few words about Me Grodno, 2019 Artur Basak Programmer, ex-Lead UI Engineer at Lition Energy Developing, Implementing and Testing User Interfaces more than 9 years. Passionate about Web, Human-Computer Interaction and Automated Testing. /artur.basak /arturbasak /front-end-in-regions-grodno
3. 3 Lition Energy Project Grodno, 2019 Lition Energy Lition Energy is an innovative electricity provider that connects consumers directly with renewable energy producers - without detours and unnecessary additional costs. On our digital platform, members choose their green power plant quickly and easily themselves.
4. UI / Frontend
5. 5 Backend: Need Help! SOS! Grodno, 2019 Need Help! SOS! Frame from «Game of Thrones» series
6. 6 Backend on High-Level Grodno, 2019 DataBase Ethereum Client External Services Frontends (SSR, SPA) Backend WS HTTP/SOAP HTTP SQL Jobs HTTP
7. 7 Backend on Low-Level Don’t start with a monolith Grodno, 2019 … when your goal is a microservices architecture Stefan Tilkov (c) https://martinfowler.com/article s/dont-start-monolith.html
8. 8 Backend on Low-Level Initial State • Legacy Codebase • Callback Hell • No DB Migrations • No Tests! • No Lints! • Not Styled! Grodno, 2019 Frame from «Game of Thrones» series
9. 9 Test Strategy? Grodno, 2019 Frame from «Game of Thrones» series
10. 10 The Testing Pyramid Grodno, 2019 https://medium.com/front-end-in-regions-grodno/the-testing-pyramid-2fec1c1fef91
11. 11 The Testing Trophy Grodno, 2019 https://testingjavascript.com
12. 12 Anatomy of Integration Test Grodno, 2019 Router / Handler Controller / Middleware DAL DB Test Input / Test Output
13. 13 Anatomy of System Test Grodno, 2019 Router / Handler Controller / Middleware DAL DB Test Input / Test Output DB Mock Check fact that mock was called
14. 14 Test Strategy «Siege» Grodno, 2019 Frame from «Game of Thrones» series
15. 15 System under Testing Grodno, 2019 DataBase Ethereum Client External Services System Tests Backend WS HTTP/SOAP SQL Jobs HTTP HTTP
16. 16 Right Way for Test Coverage Grodno, 2019 Assert(js) 2018 Conference. Screen from @aarondjents Twitter 100% ~80%
17. 17 Delta Coverage Grodno, 2019 «Herb Derby came up with the notion of delta coverage - what coverage does this test provide that's unique? Tests with zero delta coverage should be deleted unless they provide some kind of communication purpose.» Kent Beck, «Is TDD dead? #4» https://martinfowler.com/articles/is-tdd-dead
18. 18 Test Tools Grodno, 2019 Jest https://www.npmjs.com/pa ckage/supertest https://www.npmjs.com/ package/jest 1.Already used on Frontend Side 2.Backend Team have no Experience with Tests 3.All inside Box 1.Test Executor 2.Test Doubles (Spies, Mocks, Stubs) 3.Expectation Functions 4.Test Coverage Report 4.Most Popular Supertest
19. 19 Abstract TestBed Grodno, 2019 1.Build SUT 2.Define dummies & expectations
20. 20 TestBed Grodno, 2019 1.Setup DB Mockup 2.Manage Query Mockup 3.Utils
21. 21 System Test for Logout End-point Grodno, 2019 1.Create Query Mockup 2.Setup Query Mockup 3.Compare result & expectations
22. 22 Test Coverage ~40% Grodno, 2019 1.Statements 2.Branches 3.Functions 4.Lines Frames from «Game of Thrones» series
23. 23 Dive into codebase Grodno, 2019 Frames from «Game of Thrones» series
24. 24 Jest Test Configs Grodno, 2019 Unit TestBed Integration TestBed Integration Tests System Tests Unit Tests https://docs.npmjs.com/cli/run-script https://www.docker.com http://knexjs.org
25. 25 Integration TestBed Grodno, 2019 1.Manage seeds (data fixtures) 2.Configure test env
26. 26 Integration Test for Logout End-point Grodno, 2019 1.Load test data 2.Reuse fixtures
27. 27 System under Testing Grodno, 2019 DataBase Service Mock Unit Tests System Tests Integration Tests Backend HTTP/SOAP SQL HTTP Origin Service Contract Tests
28. 28 Consumer-Driven Contracts Grodno, 2019 https://thoughtworks.github.io/pacto/patterns/cdc https://docs.pact.io
29. 29 External Service Fake Grodno, 2019 1.Identify endpoint 2.Use needed fixtures 3.Setup fake service
30. 30 Contract Test Grodno, 2019 1.Make real request to external service 2.Compare response and fixtures data
31. 31 Testing Pyramid in Practice Grodno, 2019 85% 13% 2% Unit Tests - 897 Integration Tests - 142 Contract Tests - 16
32. 32 Test Coverage in Practice Grodno, 2019 0 1250 2500 3750 5000 6250 Statements - 89.18% Branches - 80.13% Functions - 93.84% Lines - 89.16% Not Covered Covered
33. 33 Links & Additions Grodno, 2019 • https://medium.com/front-end-in-regions-grodno • Lition, написанный на React.js • Доступность веб-интерфейсов. Что это и как? • https://medium.com/lition-blog • Lition and Reactjs [DevBlog] • Layout of Trading Platform [DevBlog] • What does blockchain mean for frontenders? [DevBlog] • Tests & Docs for Lition frontend [DevBlog] https://github.com/archik408/GROCON19
34. 34 Thank You and Have fun! GROCON 2019 Grodno, 2019 Frame from «Game of Thrones» series