How Much Should We Test?

Presented at SP Tech Talk

Transcript

1. HOW MUCH SHOULD WE TEST? Or how to stop hating your tests
2. GOALS OF TEST SUITE • Tests should be thorough • Tests should be stable • Tests should be fast • Tests should be few (minimal)
3. TEST DRIVEN DEVELOPMENT • We use test cases to guide the design of our code • 2 approaches to testing - Inside Out and Outside In • Outside In - Use integration tests to guide you • Inside Out - Build & test individual components, integrate later
6. Object under test
7. Object under test Incoming Messages
8. Object under test Incoming Messages Outgoing Messages
9. Object under test Incoming Messages Outgoing Messages
10. Object under test Incoming Messages Outgoing Messages Send to self
11. Object under test Incoming Messages Outgoing Messages Send to self Message Types:
12. Object under test Incoming Messages Outgoing Messages Send to self Query Message Types:
13. Object under test Incoming Messages Outgoing Messages Send to self Command Query Message Types:
14. MESSAGE TYPES • Query: Returns something / changes nothing • Command: Returns nothing / changes something Object under test Incoming Messages Outgoing Messages Send to self Command Query
21. RESOURCES • “The Magic Tricks of Testing” - Sandi Metz
 http://confreaks.tv/videos/railsconf2013- the-magic-tricks-of-testing • “Working Effectively with Unit Tests” - Jay Fields
 https://leanpub.com/wewut