Snapshot Testing

Slides van Michel Schep bij devCampNoord

Transcript

1. Je zit nu bij deze sessie!
2. • Intro snapshot testing • Demo (show me the code!) • Summary • And then time for questions About this session (Snapshot Testing with Verify)
3. 1966 Michel Schep
5. 1978 - 1992
6. 1993-2023
8. Snapshot testing
9. Snapshot testing mechanism
10. Demo • Verify (Snapshooter, Snapper, Polaroider, etc) • xUnit (maar ook voor MSTest, Nunit) • Rider (VS 2022) • WinMerge • Basic example • Scrubbers • EF Core • Logging • Web API (integration test)
11. Demo • Martin Fowler • Complex object • Scrubbers • EF Core • Loggers • Integration Test • Tools • [UsesVerify] • return Verify(actual) • verified vs received files • .gitignore • Scrub datetime and Guids • Ignore Field • Record EF Core stream • Record Logging stream • HTTP extention
12. Many extensions
13. • Snapshot testing is a different way of asserting the test results • Very easy to be up and running • Keep the snapshots simple • Verify is a library that implements the snapshot ideas • Verify is extensible (HTTP, Logging, SQL Server, EF Core, Scrubbers) • If a simple assert is possible then use a simple assert (with for example Fluent Assertions) • When possible, replace it by dedicated unit tests • Especially handy when the software works (customers are happy) but no tests and some refactoring is needed Summary
14. Questions?