This document discusses test-driven development (TDD) and its benefits. It presents examples showing that writing tests first is faster than writing code first and tests later. Key points covered include specifying requirements through tests, using tests for feedback and preventing regressions, and maintaining test code with the same quality as production code. Resources on TDD techniques and tools like ApprovalTests.com are also listed.

1. Test Driven Development
It’s All about Fluency
@LlewellynFalco

2. Is Testing Faster? (Test After)
60 Minutes
Work (code)
X minutes
Non-Work(tests)
Code
<
60 Minutes
Code + Test
60 + X minutes

3. Is Testing Faster? (Test 1st)
30 Minutes
Work (code)
X minutes
Non-Work(tests)
Code
60 Minutes <
?
Test + Code
X + 30 minutes

4. Today’s Kata: Triangle
1) A side has a distance
2) Side knows endpoints
3) 3 points
4) 3 sides
5) Perimeter
6) Get sides touching a point
7) Get side opposite a point
8) The angle of 2 sides touching a point
9) 3 angles
10) Right Triangle

6. Parts of a Test
1) Do
2) Verify

7. Demo

8. Benefits of Unit Tests
1) Specification
2) Feedback
3) Regression
4) Granularity

9. Regression
If I used to get :
Then I still get :

10. Intentional Code
// Create a Side from (0,0) to (5,0)
var side = new Side(0,0,5,0);

11. Consume 1st
Write the objects & methods you wish existed

12. Test Until Bored
Test the cases that bring you value

13. Verification
Is it the right answer?
1. Change the Question
2. Ask an expert

14. Completing the Circle
Your output should tell the story.
Objects should have ToStrings
Benefits
1. Specification
2. Feedback
3. Regression
4. Granularity

15. Fake it Till You Make It
Buys some time
Allows for Triangulation

16. Today’s Kata: Triangle
1) A side has a distance
2) Side knows endpoints
3) 3 points
4) 3 sides
5) Perimeter
6) Get sides touching a point
7) Get side opposite a point
8) The angle of 2 sides touching a point
9) 3 angles
10) Right Triangle

17. Verifying Multiples
Verify Single:
Approvals.Approve(result);
Verify Many:
Approvals.Approve(results, "label");

18. Multiple Cases
Approvals.Approve(cases, c => TestWith(c));

19. Maintaining Tests
Same Quality as Production Code

21. Resources
Test Driven Development: By Example
Kent Beck

22. Resources
www.ApprovalTests.com

23. Resources www.Develop.com
Intro To TDD Class (4 Day)
Legacy Code

24. TeachingKidsProgramming.org
Do a Recipe  Teach a Kid (Ages 10 ++)
Microsoft SmallBasic  Free Courseware (recipes)

25. Please fill out evaluations:
TDD – Fluency #AT11
@LlewellynFalco
http://LlewellynFalco.Blogspot.com
http://www.approvaltests.com @ArloBelshee
(Microsoft)
http://www.arlobelshee.com