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!!!