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Test drivendevelopment fluency

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Llewellyn Falco
Llewellyn Falco

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.

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Test Driven Development It’s All about Fluency @LlewellynFalco
Is Testing Faster? (Test After) 60 Minutes Work (code) X minutes Non-Work(tests) Code < 60 Minutes Code + Test 60 + X minutes
Is Testing Faster? (Test 1st) 30 Minutes Work (code) X minutes Non-Work(tests) Code 60 Minutes < ? Test + Code X + 30 minutes
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
Test drivendevelopment fluency
Parts of a Test 1) Do 2) Verify
Demo
Benefits of Unit Tests 1) Specification 2) Feedback 3) Regression 4) Granularity
Regression If I used to get : Then I still get :
Intentional Code // Create a Side from (0,0) to (5,0) var side = new Side(0,0,5,0);
Consume 1st Write the objects & methods you wish existed
Test Until Bored Test the cases that bring you value
Verification Is it the right answer? 1. Change the Question 2. Ask an expert
Completing the Circle Your output should tell the story. Objects should have ToStrings Benefits 1. Specification 2. Feedback 3. Regression 4. Granularity
Fake it Till You Make It Buys some time Allows for Triangulation
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
Verifying Multiples Verify Single: Approvals.Approve(result); Verify Many: Approvals.Approve(results, "label");
Multiple Cases Approvals.Approve(cases, c => TestWith(c));
Maintaining Tests Same Quality as Production Code
Test drivendevelopment fluency
Resources Test Driven Development: By Example Kent Beck
Resources www.ApprovalTests.com
Resources www.Develop.com Intro To TDD Class (4 Day) Legacy Code
TeachingKidsProgramming.org Do a Recipe  Teach a Kid (Ages 10 ++) Microsoft SmallBasic  Free Courseware (recipes)
Please fill out evaluations: TDD – Fluency #AT11 @LlewellynFalco http://LlewellynFalco.Blogspot.com http://www.approvaltests.com @ArloBelshee (Microsoft) http://www.arlobelshee.com

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Test drivendevelopment fluency

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