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TDD/BDD
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Shintaro Kaneko
October 23, 2014
Programming
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120
TDD/BDD
Test-Driven Development
Shintaro Kaneko
October 23, 2014
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Transcript
TDD / BDD Introducing with Objective-C using XCTest © kaneshin,
2014 1
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
What is TDD? © kaneshin, 2014 3
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
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
TDD life-cycle © kaneshin, 2014 6
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
1. Write a test and confirm failure 2. Write code
to pass all tests 3. Clean up code Repeat © kaneshin, 2014 8
For example Just Adding Calculator Add A to B ©
kaneshin, 2014 9
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
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
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
Refine the code @implementation Calc - (double)add:(double)a to:(double)b { return
a + b; } @end 4 Run all tests. © kaneshin, 2014 13
Got it? 4 Memorize the figure 4 Test-First 4 Should
be failed 4 Refactor, Refactor, Refactor © kaneshin, 2014 14
How to play TDD? Demo (Japanese) © kaneshin, 2014 15
Wizard Role-Play ຐ๏͍ͷϩʔϧϓϨΠ © kaneshin, 2014 16
Wizard Spec (ຐ๏͍) 4 Level 1 : ௨ৗ߈ܸ͕Ͱ͖Δ (Attack: 1
Damage) 4 Level 3 : Ϊϥ͕͑Δ (Sizz: 2 Damage) 4 Level 5 : ϝϥϛ͕͑Δ (Frizzle: 2 Damage) 4 Level up ʹExp 30͕ҰͰඞཁ (؆ศͷͨΊ) © kaneshin, 2014 17
Slime Spec (εϥΠϜ) 4 Life: 2, Exp: 10 Goblin Spec
(ΰϒϦϯ) 4 Life: 5, Exp: 30 ※ϞϯελʔҰܦݧΛऔಘ͞ΕΔͱExp0ͱͳΔ © kaneshin, 2014 18
What is BDD? © kaneshin, 2014 19
BDD means Behavior-Driven Development. 4 Basically, it is based on
TDD. © kaneshin, 2014 20
What is the difference between BDD and TDD? © kaneshin,
2014 21
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
How to manipulate BDD? Demo (Japanese) © kaneshin, 2014 23
Thanks © kaneshin, 2014 24