Obstacle Driven Development: Extending Test Driven Development
Test Driven Development
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Test Driven Development Ben Carey NuSoft Solutions
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This was one of my first presentations that I gave in Columbus, Ohio at an event called "Day of .Net"
Transcript of Test Driven Development
Test Driven Development
Ben CareyNuSoft Solutions
The Presentation What is TDD? How do I do it? Why do it? Lessons learned Resources Q&A
What do you want to talk about? (please interrupt)
What is TDD? Writing clean code that works The use of testing for…
Automated Feedback Incremental Design
It’s more than just unit testing Developer Tests Functional Tests Performance Tests Regression Tests Design in the context of today’s problem
What is TDD?
How do I do it? Think about what you want to do. Think about how to test it. Write a small test. Watch it fail. Write enough code to watch it pass. Refactor
Once and only once DRY
Repeat
How do I do it? Demo
Why do it? Feedback
Know what works Know what doesn’t
work Change things (and
know if it worked)
Why do it? Communication
Executable documentation It’s always up to date How many of your requirements / design documents
can be proven? Give new team members code instead of word
documents Demonstrate intent Show usage
Why do it?
Why do it? Simplicity
Organic Architecture Empathetic code We (by habit) over-engineer our code Keep architecture / design in proportion to
today's needs Design based on feedback / experience
Why do it? Courage vs. Fear
What are the implications of this change?
Did I break anything? Trust
Lessons Learned Readable trumps well-factored Red / Green / Refactor = Flow Defects – Prove it, then fix it (forever) Adopt multiple levels of testing The 10 minute rule Use Mock objects
Good Stuff Test Driven Development: By Example Test-Driven Development in Microsoft .Net Pragmatic Unit Testing in C# with NUnit
www.testdriven.com www.testingreflections.com www.c2.com
