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
   

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2. @rockname
   גࣜձࣾϛΫγΟ / ΈͯͶࣄۀ෦
   ΞϓϦ։ൃG 18৽ଔ
   iOS(Swift, objc) > Android(Kotlin, Java) == Rails(ruby)
   ˎॻ͘ྔͷॱ൪
   

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3. ΈͯͶͰ͸νʔϜશମͰ

   ςετΛॻ͘จԽ͕

   ࠜ෇͍͍ͯΔ
   

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4. ςετ͕ͳ͔ͬͨΒbotʹἤΒΕΔ
   

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5. iOSͷςετ؀ڥ
   • ςετϑϨʔϜϫʔΫͱͯ͠ Quick/Nimble Λ࠾༻
   • RSpecʹΠϯεύΠΞ͞ΕͨBDD Framework
   • ΈͯͶ͸ServerͷςετΛRSpecͰॻ͍͍ͯΔͷͰ׳Ε͍ͯΔਓ͕ؒ
   ଟ͍
   • Mock͸…
   • ಛʹϥΠϒϥϦ͸࢖͍ͬͯͳ͍ (Φεεϝ͕͋Ε͹ڭ͍͑ͯͩ͘͞)
   • Mock ObjectΛςετ͝ͱʹఆ͍ٛͯ͠Δ
   

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6. BDDͰςετΛॻ͘ͳΒ

   ಡΈ΍͍͢ςετΛॻ͖͍ͨ…ʂ
   

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7. Better Specs
   

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8. Better Specs ͱ͸ʁ
   • RSpecʹ͓͚Δྑ͍ςετͷ࡞ΓํΛूΊͨΨΠυϥΠϯ
   • GitHubͰopenʹ؅ཧ͞Ε͍ͯΔ
   • ॻ͖ํʹٙ໰͕͋Ε͹issue্Ͱٞ࿦͢Δ͜ͱ͕Ͱ͖Δ
   • RSpecͷॻ͖ํʹ໎ͬͨΒྑ͘ݟΔ
   

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9. RSpecʹӨڹ͞ΕͨQuickͰ΋
   Better Specs ʹͳΒͬͯ

   ՄಡੑΛ্͛Δͧ
   

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10. FizzBuzzؔ਺ͷςετΛॻ͘
    • Ҿ਺ʹIntΛऔΓɺ
    • 3ͷഒ਺ͷ࣌ -> “Fizz”
    • 5ͷഒ਺ͷ࣌ -> “Buzz”
    • 3ͱ5ͷެഒ਺ͷ࣌ -> “FizzBuzz”
    • 0ҎԼͷ࣌ -> “out of range”
    • ͦΕҎ֎ͷ࣌ -> ༩͑ΒΕͨ਺ࣈΛͦͷ··ฦ͢
    

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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)
    }
    }
    }
    

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12. ·ͣ͸Կ΋ߟ͑ͣʹͱΓ͋͑ͣ

    ςετΛॻ͍ͯΈΔ ✍
    

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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"))
    }
    }
    }
    }
    

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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
    

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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·͍
    

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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”
    

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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”
    

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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”
    

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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”
    

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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
    

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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"))
    }
    }
    }
    }
    

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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
    

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23. Better Specs
    1. ୯Ұ৚݅ςετ

    2. ContextΛ࢖͏

    3. SubjectΛ࢖͏
    

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24. Better Specs
    1. ୯Ұ৚݅ςετ

    2. ContextΛ࢖͏

    3. SubjectΛ࢖͏
    

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25. #FUUFS4QFDT
    

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26. #FUUFS4QFDT
    

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27. #FUUFS4QFDT
    

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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
    

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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”
    

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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”
    

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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”
    

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32. Better Specs
    1. ୯Ұ৚݅ςετ

    2. ContextΛ࢖͏

    3. SubjectΛ࢖͏
    

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33. #FUUFS4QFDT
    

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34. #FUUFS4QFDT
    

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35. #FUUFS4QFDT
    

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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
    

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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”
    

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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”
    

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39. Better Specs
    1. ୯Ұ৚݅ςετ

    2. ContextΛ࢖͏

    3. SubjectΛ࢖͏
    

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40. #FUUFS4QFDT
    

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41. #FUUFS4QFDT
    

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42. #FUUFS4QFDT
    

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43. #FUUFS4QFDT
    subject = ςετର৅ͷओମ
    

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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
    

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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
    

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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୅ೖ
    

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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౉͢
    

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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
    
    

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49. Ͳ͏มΘͬͨͷ
    

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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"))
    }
    }
    }
    }
    

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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
    

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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)
    

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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)
    

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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)
    

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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)
    

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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)
    
    

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57. ·ͱΊ
    • Quick͸RSpecʹΠϯεύΠΞ͞ΕͨBDD Framework
    • BetterSpecsʹͳΒͬͯॻ͘͜ͱͰɺͦͷϝιουͷ࢓༷͕ཧղ͠
    ΍͘͢ͳΔςετΛॻ͚Δ (Spec = Specification = ࢓༷ॻ)
    • ͨͩɺ޷͖ݏ͍͸ඞͣ͋ΔͷͰڧ੍͸ྑ͘ͳ͍ 

    (XCTestͰ΋What/When/HowΛҙࣝͨ͠ςετ͸ॻ͚Δ)
    

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58. Thank you!!!
    

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