Test Driven Development

Test Driven Development Ben Carey NuSoft 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

The End
Contact Info:
Ben Carey
[email_address]
NuSoft Solutions
614-607-3754

Test Driven Development

by Ben Carey

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Test Driven Development Presentation Transcript