Swiftにおける本当にRSpecライクなテストの書き方 / RSpec-like Test in Swift

Transcript

1. ~Better Specs ʹֶͿ~ Swiftʹ͓͚Δຊ౰ʹ
 RSpecϥΠΫͳςετͷॻ͖ํ iOS Test Night #9 - 2प೥ - 2018/12/10 @rockname
2. @rockname גࣜձࣾϛΫγΟ / ΈͯͶࣄۀ෦ ΞϓϦ։ൃG 18৽ଔ iOS(Swift, objc) > Android(Kotlin, Java) == Rails(ruby) ˎ
   ॻ͘ྔͷॱ൪
3. ΈͯͶͰ͸νʔϜશମͰ
 ςετΛॻ͘จԽ͕
 ࠜ෇͍͍ͯΔ
4. ςετ͕ͳ͔ͬͨΒbotʹἤΒΕΔ
5. iOSͷςετ؀ڥ • ςετϑϨʔϜϫʔΫͱͯ͠ Quick/Nimble Λ࠾༻ • RSpecʹΠϯεύΠΞ͞ΕͨBDD Framework • ΈͯͶ͸ServerͷςετΛRSpecͰॻ͍͍ͯΔͷͰ׳Ε͍ͯΔਓ͕ؒ ଟ͍ • Mock͸… • ಛʹϥΠϒϥϦ͸࢖͍ͬͯͳ͍ (Φεεϝ͕͋Ε͹ڭ͍͑ͯͩ͘͞) • Mock ObjectΛςετ͝ͱʹఆ͍ٛͯ͠Δ
6. BDDͰςετΛॻ͘ͳΒ
 ಡΈ΍͍͢ςετΛॻ͖͍ͨ…ʂ
7. Better Specs
8. Better Specs ͱ͸ʁ • RSpecʹ͓͚Δྑ͍ςετͷ࡞ΓํΛूΊͨΨΠυϥΠϯ • GitHubͰopenʹ؅ཧ͞Ε͍ͯΔ • ॻ͖ํʹٙ໰͕͋Ε͹issue্Ͱٞ࿦͢Δ͜ͱ͕Ͱ͖Δ • RSpecͷॻ͖ํʹ໎ͬͨΒྑ͘ݟΔ
9. RSpecʹӨڹ͞ΕͨQuickͰ΋ Better Specs ʹͳΒͬͯ
 ՄಡੑΛ্͛Δͧ
10. FizzBuzzؔ਺ͷςετΛॻ͘ • Ҿ਺ʹIntΛऔΓɺ • 3ͷഒ਺ͷ࣌ -> “Fizz” • 5ͷഒ਺ͷ࣌ -> “Buzz” • 3ͱ5ͷެഒ਺ͷ࣌ -> “FizzBuzz” • 0ҎԼͷ࣌ -> “out of range” • ͦΕҎ֎ͷ࣌ -> ༩͑ΒΕͨ਺ࣈΛͦͷ··ฦ͢
11. FizzBuzzؔ਺ enum FizzBuzz { static func fizzBuzz(_ number: Int) -> String { guard number > 0 else { return "out of range” } switch number { case let n where n % 15 == 0: return "FizzBuzz" case let n where n % 5 == 0: return "Buzz" case let n where n % 3 == 0: return "Fizz" default: return String(number) } } }
12. ·ͣ͸Կ΋ߟ͑ͣʹͱΓ͋͑ͣ
 ςετΛॻ͍ͯΈΔ ✍
13. ͳʹ΋ߟ͑ͣʹॻ͍ͨςετ class FizzBuzzSpec: QuickSpec { override func spec() { describe("#fizzBuzz") { it("should meet all FizzBuzz specifications") { expect(FizzBuzz.fizzBuzz(3)).to(equal("Fizz")) expect(FizzBuzz.fizzBuzz(5)).to(equal("Buzz")) expect(FizzBuzz.fizzBuzz(15)).to(equal("FizzBuzz")) expect(FizzBuzz.fizzBuzz(-1)) .to(equal(“out of range")) expect(FizzBuzz.fizzBuzz(1)).to(equal("1")) } } } }
14. ͳʹ΋ߟ͑ͣʹॻ͍ͨςετ class FizzBuzzSpec: QuickSpec { override func spec() { describe("#fizzBuzz") { it("should meet all FizzBuzz specifications") { expect(FizzBuzz.fizzBuzz(3)).to(equal("Fizz")) expect(FizzBuzz.fizzBuzz(5)).to(equal("Buzz")) expect(FizzBuzz.fizzBuzz(15)).to(equal("FizzBuzz")) expect(FizzBuzz.fizzBuzz(-1)) .to(equal(“out of range")) expect(FizzBuzz.fizzBuzz(1)).to(equal("1")) } } } } ςετର৅ͷϝιου
15. ͳʹ΋ߟ͑ͣʹॻ͍ͨςετ class FizzBuzzSpec: QuickSpec { override func spec() { describe("#fizzBuzz") { it("should meet all FizzBuzz specifications") { expect(FizzBuzz.fizzBuzz(3)).to(equal("Fizz")) expect(FizzBuzz.fizzBuzz(5)).to(equal("Buzz")) expect(FizzBuzz.fizzBuzz(15)).to(equal("FizzBuzz")) expect(FizzBuzz.fizzBuzz(-1)) .to(equal(“out of range")) expect(FizzBuzz.fizzBuzz(1)).to(equal("1")) } } } } ظ଴͞ΕΔϝιουͷ;Δ·͍
16. ͳʹ΋ߟ͑ͣʹॻ͍ͨςετ class FizzBuzzSpec: QuickSpec { override func spec() { describe("#fizzBuzz") { it("should meet all FizzBuzz specifications") { expect(FizzBuzz.fizzBuzz(3)).to(equal("Fizz")) expect(FizzBuzz.fizzBuzz(5)).to(equal("Buzz")) expect(FizzBuzz.fizzBuzz(15)).to(equal("FizzBuzz")) expect(FizzBuzz.fizzBuzz(-1)) .to(equal(“out of range")) expect(FizzBuzz.fizzBuzz(1)).to(equal("1")) } } } } 3ͷഒ਺ͷ࣌ -> “Fizz”
17. ͳʹ΋ߟ͑ͣʹॻ͍ͨςετ class FizzBuzzSpec: QuickSpec { override func spec() { describe("#fizzBuzz") { it("should meet all FizzBuzz specifications") { expect(FizzBuzz.fizzBuzz(3)).to(equal("Fizz")) expect(FizzBuzz.fizzBuzz(5)).to(equal("Buzz")) expect(FizzBuzz.fizzBuzz(15)).to(equal("FizzBuzz")) expect(FizzBuzz.fizzBuzz(-1)) .to(equal(“out of range")) expect(FizzBuzz.fizzBuzz(1)).to(equal("1")) } } } } 5ͷഒ਺ͷ࣌ -> “Buzz”
18. ͳʹ΋ߟ͑ͣʹॻ͍ͨςετ class FizzBuzzSpec: QuickSpec { override func spec() { describe("#fizzBuzz") { it("should meet all FizzBuzz specifications") { expect(FizzBuzz.fizzBuzz(3)).to(equal("Fizz")) expect(FizzBuzz.fizzBuzz(5)).to(equal("Buzz")) expect(FizzBuzz.fizzBuzz(15)).to(equal("FizzBuzz")) expect(FizzBuzz.fizzBuzz(-1)) .to(equal(“out of range")) expect(FizzBuzz.fizzBuzz(1)).to(equal("1")) } } } } 3ͱ5ͷެഒ਺ͷ࣌ -> “FizzBuzz”
19. ͳʹ΋ߟ͑ͣʹॻ͍ͨςετ class FizzBuzzSpec: QuickSpec { override func spec() { describe("#fizzBuzz") { it("should meet all FizzBuzz specifications") { expect(FizzBuzz.fizzBuzz(3)).to(equal("Fizz")) expect(FizzBuzz.fizzBuzz(5)).to(equal("Buzz")) expect(FizzBuzz.fizzBuzz(15)).to(equal("FizzBuzz")) expect(FizzBuzz.fizzBuzz(-1)) .to(equal(“out of range")) expect(FizzBuzz.fizzBuzz(1)).to(equal("1")) } } } } 0ҎԼͷ࣌ -> ”out of range”
20. ͳʹ΋ߟ͑ͣʹॻ͍ͨςετ class FizzBuzzSpec: QuickSpec { override func spec() { describe("#fizzBuzz") { it("should meet all FizzBuzz specifications") { expect(FizzBuzz.fizzBuzz(3)).to(equal("Fizz")) expect(FizzBuzz.fizzBuzz(5)).to(equal("Buzz")) expect(FizzBuzz.fizzBuzz(15)).to(equal("FizzBuzz")) expect(FizzBuzz.fizzBuzz(-1)) .to(equal(“out of range")) expect(FizzBuzz.fizzBuzz(1)).to(equal("1")) } } } } ͦΕҎ֎ͷ࣌ -> ༩͑ΒΕͨ਺ࣈ
21. ͳʹ΋ߟ͑ͣʹॻ͍ͨςετ class FizzBuzzSpec: QuickSpec { override func spec() { describe("#fizzBuzz") { it("should meet all FizzBuzz specifications") { expect(FizzBuzz.fizzBuzz(3)).to(equal("Fizz")) expect(FizzBuzz.fizzBuzz(5)).to(equal("Buzz")) expect(FizzBuzz.fizzBuzz(15)).to(equal("FizzBuzz")) expect(FizzBuzz.fizzBuzz(-1)) .to(equal(“out of range")) expect(FizzBuzz.fizzBuzz(1)).to(equal("1")) } } } }
22. ͳʹ΋ߟ͑ͣʹॻ͍ͨςετ class FizzBuzzSpec: QuickSpec { override func spec() { describe("#fizzBuzz") { it("should meet all FizzBuzz specifications") { expect(FizzBuzz.fizzBuzz(3)).to(equal("Fizz")) expect(FizzBuzz.fizzBuzz(5)).to(equal("Buzz")) expect(FizzBuzz.fizzBuzz(15)).to(equal("FizzBuzz")) expect(FizzBuzz.fizzBuzz(-1)) .to(equal(“out of range")) expect(FizzBuzz.fizzBuzz(1)).to(equal("1")) } } } } ύοͱݟͯ΋ϝιουͷৼΔ෣͍͕ ཧղ͠ʹ͍͘
23. Better Specs 1. ୯Ұ৚݅ςετ
 2. ContextΛ࢖͏
 3. SubjectΛ࢖͏
24. Better Specs 1. ୯Ұ৚݅ςετ
 2. ContextΛ࢖͏
 3. SubjectΛ࢖͏
25. 
    #FUUFS
    4QFDT
26. 
    #FUUFS
    4QFDT
27. 
    #FUUFS
    4QFDT
28. ୯Ұ৚݅ςετ describe("#fizzBuzz") { it("should return Fizz when given multiples of 3") { expect(FizzBuzz.fizzBuzz(3)).to(equal("Fizz")) } it("should return Buzz when given multiples of 5") { expect(FizzBuzz.fizzBuzz(5)).to(equal("Buzz")) } it("should return FizzBuzz when given multiples of both 3 and 5") { expect(FizzBuzz.fizzBuzz(15)).to(equal("FizzBuzz")) } ɾ ɾ ɾ
29. ୯Ұ৚݅ςετ describe("#fizzBuzz") { it("should return Fizz when given multiples of 3") { expect(FizzBuzz.fizzBuzz(3)).to(equal("Fizz")) } it("should return Buzz when given multiples of 5") { expect(FizzBuzz.fizzBuzz(5)).to(equal("Buzz")) } it("should return FizzBuzz when given multiples of both 3 and 5") { expect(FizzBuzz.fizzBuzz(15)).to(equal("FizzBuzz")) } ɾ ɾ ɾ 3ͷഒ਺ͷ࣌ -> “Fizz”
30. ୯Ұ৚݅ςετ describe("#fizzBuzz") { it("should return Fizz when given multiples of 3") { expect(FizzBuzz.fizzBuzz(3)).to(equal("Fizz")) } it("should return Buzz when given multiples of 5") { expect(FizzBuzz.fizzBuzz(5)).to(equal("Buzz")) } it("should return FizzBuzz when given multiples of both 3 and 5") { expect(FizzBuzz.fizzBuzz(15)).to(equal("FizzBuzz")) } ɾ ɾ ɾ 5ͷഒ਺ͷ࣌ -> “Buzz”
31. ୯Ұ৚݅ςετ describe("#fizzBuzz") { it("should return Fizz when given multiples of 3") { expect(FizzBuzz.fizzBuzz(3)).to(equal("Fizz")) } it("should return Buzz when given multiples of 5") { expect(FizzBuzz.fizzBuzz(5)).to(equal("Buzz")) } it("should return FizzBuzz when given multiples of both 3 and 5") { expect(FizzBuzz.fizzBuzz(15)).to(equal("FizzBuzz")) } ɾ ɾ ɾ 3ͱ5ͷެഒ਺ͷ࣌ -> “FizzBuzz”
32. Better Specs 1. ୯Ұ৚݅ςετ
 2. ContextΛ࢖͏
 3. SubjectΛ࢖͏
33. 
    #FUUFS
    4QFDT
34. 
    #FUUFS
    4QFDT
35. 
    #FUUFS
    4QFDT
36. ContextΛ࢖͏ describe("#fizzBuzz") { context("when given multiples of 3") { it("should return Fizz") { expect(FizzBuzz.fizzBuzz(3)).to(equal("Fizz")) } } context("when given multiples of 5") { it("should return Buzz") { expect(FizzBuzz.fizzBuzz(5)).to(equal("Buzz")) } } ɾ ɾ ɾ
37. ContextΛ࢖͏ describe("#fizzBuzz") { context("when given multiples of 3") { it("should return Fizz") { expect(FizzBuzz.fizzBuzz(3)).to(equal("Fizz")) } } context("when given multiples of 5") { it("should return Buzz") { expect(FizzBuzz.fizzBuzz(5)).to(equal("Buzz")) } } ɾ ɾ ɾ 3ͷഒ਺ͷ࣌ -> “Fizz”
38. ContextΛ࢖͏ describe("#fizzBuzz") { context("when given multiples of 3") { it("should return Fizz") { expect(FizzBuzz.fizzBuzz(3)).to(equal("Fizz")) } } context("when given multiples of 5") { it("should return Buzz") { expect(FizzBuzz.fizzBuzz(5)).to(equal("Buzz")) } } ɾ ɾ ɾ 5ͷഒ਺ͷ࣌ -> “Buzz”
39. Better Specs 1. ୯Ұ৚݅ςετ
 2. ContextΛ࢖͏
 3. SubjectΛ࢖͏
40. 
    #FUUFS
    4QFDT
41. 
    #FUUFS
    4QFDT
42. 
    #FUUFS
    4QFDT
43. 
    #FUUFS
    4QFDT subject = ςετର৅ͷओମ
44. SubjectΛ࢖͏ describe("#fizzBuzz") { var number: Int! var subject: String { return FizzBuzz.fizzBuzz(number) } context("when given multiples of 3") { beforeEach { number = 3 } it("should return Fizz") { expect(subject).to(equal("Fizz")) } } ɾ ɾ ɾ
45. SubjectΛ࢖͏ describe("#fizzBuzz") { var number: Int! var subject: String { return FizzBuzz.fizzBuzz(number) } context("when given multiples of 3") { beforeEach { number = 3 } it("should return Fizz") { expect(subject).to(equal("Fizz")) } } ɾ ɾ ɾ Ҿ਺Λม਺ͱͯ͠ఆٛ subjectΛܭࢉܕϓϩύςΟͱͯ͠એݴ
46. SubjectΛ࢖͏ describe("#fizzBuzz") { var number: Int! var subject: String { return FizzBuzz.fizzBuzz(number) } context("when given multiples of 3") { beforeEach { number = 3 } it("should return Fizz") { expect(subject).to(equal("Fizz")) } } ɾ ɾ ɾ beforeEach ͰcontextʹԠͨ͡
 ஋Λnumberม਺ʹ୅ೖ
47. SubjectΛ࢖͏ describe("#fizzBuzz") { var number: Int! var subject: String { return FizzBuzz.fizzBuzz(number) } context("when given multiples of 3") { beforeEach { number = 3 } it("should return Fizz") { expect(subject).to(equal("Fizz")) } } ɾ ɾ ɾ ɹexpectʹ͸subjectͷΈ౉͢
48. SubjectΛ࢖͏ describe("#fizzBuzz") { var number: Int! var subject: String { return FizzBuzz.fizzBuzz(number) } context("when given multiples of 3") { beforeEach { number = 3 } it("should return Fizz") { expect(subject).to(equal("Fizz")) } } ɾ ɾ ɾ
49. Ͳ͏มΘͬͨͷ
50. Before class FizzBuzzSpec: QuickSpec { override func spec() { describe("#fizzBuzz") { it("should meet all FizzBuzz specifications") { expect(FizzBuzz.fizzBuzz(3)).to(equal("Fizz")) expect(FizzBuzz.fizzBuzz(5)).to(equal("Buzz")) expect(FizzBuzz.fizzBuzz(15)).to(equal("FizzBuzz")) expect(FizzBuzz.fizzBuzz(-1)) .to(equal(“out of range")) expect(FizzBuzz.fizzBuzz(1)).to(equal("1")) } } } }
51. After describe("#fizzBuzz") { var number: Int! var subject: String { return FizzBuzz.fizzBuzz(number) } context("when given multiples of 3") { beforeEach { number = 3 } it("should return Fizz") { expect(subject).to(equal("Fizz")) } } ɾ ɾ ɾ
52. After describe("#fizzBuzz") { var number: Int! var subject: String { return FizzBuzz.fizzBuzz(number) } context("when given multiples of 3") { beforeEach { number = 3 } it("should return Fizz") { expect(subject).to(equal("Fizz")) } } ɾ ɾ ɾ Կ͕ (What)
53. After describe("#fizzBuzz") { var number: Int! var subject: String { return FizzBuzz.fizzBuzz(number) } context("when given multiples of 3") { beforeEach { number = 3 } it("should return Fizz") { expect(subject).to(equal("Fizz")) } } ɾ ɾ ɾ Կ͕ (What) ͍ͭ (When)
54. After describe("#fizzBuzz") { var number: Int! var subject: String { return FizzBuzz.fizzBuzz(number) } context("when given multiples of 3") { beforeEach { number = 3 } it("should return Fizz") { expect(subject).to(equal("Fizz")) } } ɾ ɾ ɾ ͍ͭ (When) Կ͕ (What) Ͳ͏ͳΔͷ͔ (How)
55. After describe("#fizzBuzz") { var number: Int! var subject: String { return FizzBuzz.fizzBuzz(number) } context("when given multiples of 3") { beforeEach { number = 3 } it("should return Fizz") { expect(subject).to(equal("Fizz")) } } ɾ ɾ ɾ ͍ͭ (When) Կ͕ (What) Ͳ͏ͳΔͷ͔ (How)
56. After describe("#fizzBuzz") { var number: Int! var subject: String { return FizzBuzz.fizzBuzz(number) } context("when given multiples of 3") { beforeEach { number = 3 } it("should return Fizz") { expect(subject).to(equal("Fizz")) } } ɾ ɾ ɾ ͍ͭ (When) Կ͕ (What) Ͳ͏ͳΔͷ͔ (How)
57. ·ͱΊ • Quick͸RSpecʹΠϯεύΠΞ͞ΕͨBDD Framework • BetterSpecsʹͳΒͬͯॻ͘͜ͱͰɺͦͷϝιουͷ࢓༷͕ཧղ͠ ΍͘͢ͳΔςετΛॻ͚Δ (Spec = Specification = ࢓༷ॻ) • ͨͩɺ޷͖ݏ͍͸ඞͣ͋ΔͷͰڧ੍͸ྑ͘ͳ͍ 
 (XCTestͰ΋What/When/HowΛҙࣝͨ͠ςετ͸ॻ͚Δ)
58. Thank you!!!