TDD/BDD

Test-Driven Development

1. TDD / BDD Introducing with Objective-C using XCTest © kaneshin, 2014 1
2. Agenda 4 What is TDD? 4 TDD life-cycle 4 How to play TDD? (Demo) 4 What is BDD? 4 What is the difference between BDD and TDD? 4 How to manipulate BDD? (Demo) © kaneshin, 2014 2
3. What is TDD? © kaneshin, 2014 3
4. TDD means Test-Driven Development. 4 Ensure your source code. 4 Understand the feature's specification/s and requirement/s. 4 Easily to adopt Agile for your project. 4 ... © kaneshin, 2014 4
5. TDD is NOT about testing. 4 TDD is about Development. 4 It's all about expressing intent. 4 Specifically, improving your project. 4 Covering unit tests powerfully. © kaneshin, 2014 5
6. TDD life-cycle © kaneshin, 2014 6
7. 1. Write a test (Test-First) 2. Run the test (Should be FAILED) 3. Write code (Make the test pass) 4. Run all tests 5. Refactor (Clean up code) Repeat © kaneshin, 2014 7
8. 1. Write a test and confirm failure 2. Write code to pass all tests 3. Clean up code Repeat © kaneshin, 2014 8
9. For example Just Adding Calculator Add A to B © kaneshin, 2014 9
10. Write a test. - (void)testAdd3To4 { Calc *calc = [Calc new]; XCTAssertEqualWithAccuracy( [calc add:3 to:4], 7, .001 ); } 4 Should be failed on build because there is no implementation. © kaneshin, 2014 10
11. Write code @interface Calc : NSObject - (double)add:(double)a to:(double)b; @end @implementation Calc - (double)add:(double)a to:(double)b { return 0.; } @end © kaneshin, 2014 11
12. Make the test pass @implementation Calc - (double)add:(double)a to:(double)b { return 7.; } @end 4 Just enough code to pass. © kaneshin, 2014 12
13. Refine the code @implementation Calc - (double)add:(double)a to:(double)b { return a + b; } @end 4 Run all tests. © kaneshin, 2014 13
14. Got it? 4 Memorize the figure 4 Test-First 4 Should be failed 4 Refactor, Refactor, Refactor © kaneshin, 2014 14
15. How to play TDD? Demo (Japanese) © kaneshin, 2014 15
16. Wizard Role-Play ຐ๏࢖͍ͷϩʔϧϓϨΠ © kaneshin, 2014 16
17. Wizard Spec (ຐ๏࢖͍) 4 Level 1 : ௨ৗ߈ܸ͕Ͱ͖Δ (Attack: 1 Damage) 4 Level 3 : Ϊϥ͕࢖͑Δ (Sizz: 2 Damage) 4 Level 5 : ϝϥϛ͕࢖͑Δ (Frizzle: 2 Damage) 4 Level up ʹ͸Exp 30͕Ұ཯Ͱඞཁ (؆ศͷͨΊ) © kaneshin, 2014 17
18. Slime Spec (εϥΠϜ) 4 Life: 2, Exp: 10 Goblin Spec (ΰϒϦϯ) 4 Life: 5, Exp: 30 ※Ϟϯελʔ͸Ұ౓ܦݧ஋Λऔಘ͞ΕΔͱExp͸0ͱͳΔ © kaneshin, 2014 18
19. What is BDD? © kaneshin, 2014 19
20. BDD means Behavior-Driven Development. 4 Basically, it is based on TDD. © kaneshin, 2014 20
21. What is the difference between BDD and TDD? © kaneshin, 2014 21
22. The difference between BDD and TDD? 4 TDD is focused How on code. 4 Just satisfied spec/s and requirement/s. 4 We wanna confirm a state transition. 4 A State is transitioning every-time. 4 Test-suites might have scenes on conditions. 4 BDD can check the validity of scenes. © kaneshin, 2014 22
23. How to manipulate BDD? Demo (Japanese) © kaneshin, 2014 23
24. Thanks © kaneshin, 2014 24