As a developers we always want to push our limits further and produce features quick and with high internal quality. In my team we write a lot of tests, and I want to share some learned lessons with you. I will show different decomposition technics and testing approaches. I will review and compare several existing libraries for unit tests.

1. DO YOU WANT TO TALK ABOUT
UNIT TESTIG IN SWIFT?
#itsat @daloog
¯_( )_/¯
Alexey Demedetskiy
Sigma Software

2. THANK YOU APPLE!

3. 99% OF IOS APPS ARE
SHIPPED WITH UNIT TESTING!

4. WORKOUT TIME!!

6. ( °□°)

7. ARE UNIT TESTS WORTH IT?
HTTP://STACKOVERFLOW.COM/QUESTIONS/237000/IS-
THERE-HARD-EVIDENCE-OF-THE-ROI-OF-UNIT-TESTING

8. TIME += 30%
HTTP://COLLABORATION.CSC.NCSU.EDU/LAURIE/PAPERS/
TDDPAPERV8.PDF

9. DEFECTS -= 60%
HTTP://RESEARCH.MICROSOFT.COM/EN-US/GROUPS/ESE/
NAGAPPAN_TDD.PDF

10. TESTS ARE GREAT!

11. !(ಠ ಠ!)

12. WHY WE ARE NOT RUBY?

14. 1) MARKET HUSTLE

15. 2) APPLE FRAMEWORKS

16. 3) LACK OF EXPERTISE

17. 4) OUTSOURCE

18. ⌛ ➡ 💰

19. UNIT TESTS ARE WRITTEN
BY DEVELOPERS.

21. TESTS ARE DEVELOPERS
RESPONSIBILITY

22. DON’T SELL THEM
WRITE THEM

23. WHY DO WE NEED TO WRITE
TESTS?

24. 1) REFACTORING

25. 2) CONFIDENCE

26. 3) CATCHING ERRORS

27. 4) REGRESSION

28. 🐞➡❌➡⌨➡✅

29. HOW TO WRITE TESTS?

30. 🍕 🛠
🌌

31. UNIT
AS SMALLEST LOGIC CONTAINER
🍕

32. FUNCTION

33. INPUT ➡ OUTPUT

36. PURE FUNCTIONS

37. METHOD

38. MUTATION OF STATE

40. VOID ➡ VOID

41. INPUT ➡ OUTPUT

42. DOMAIN == CODOMAIN

43. ALL MY CODE IS
FUNCTIONAL, WHERE EVERY
FUNCTION TAKES ONE
ARGUMENT: ALL MY
PROGRAM'S STATE.

44. OBJECT

46. DEPENDENCIES

47. TRANSITIVE DEPENDENCIES

49. INITIAL STATE

50. ORDER OF OPERATIONS

51. UNIT
AS SMALLEST LOGIC CONTAINER
🍕

52. 🍕 🛠
🌌

53. TESTS
🛠

54. GWT

55. GIVEN
WHEN
THEN

57. AAA

58. ARRANGE
ACT
ASSERT

60. SRV

61. SETUP
RECORD
VERIFY

62. FUNCTIONS - GWT

63. METHODS - AAA

64. OBJECTS - SRV

65. VALUE TESTS

66. BEHAVIOR TESTS

67. INTEGRATION TESTS

68. CLIENT TESTS

69. PYRAMID OF TESTS
HTTP://TODDLITTLEWEB.COM/WORDPRESS/2014/06/23/
THE-TESTING-DIAMOND-AND-THE-PYRAMID-2/

72. TEST COVERAGE
HTTP://MARTINFOWLER.COM/BLIKI/
TESTCOVERAGE.HTML

75. TESTS
🛠

76. 🍕 🛠
🌌

77. SIDE EFFECTS
🌌

78. RETURN VALUE

79. FUNCTION CALL

80. STATE CHANGE

81. SIDE EFFECTS
🌌

82. 🍕 🛠
🌌

83. SWIFT

84. DEPENDENCIES

85. STRUCT

86. INTERNAL

88. PROTOCOL

89. EXTERNAL

90. XCTEST

91. QUICK / NIMBLE
HTTPS://GITHUB.COM/QUICK/QUICK

92. RECORDER
HTTPS://GIST.GITHUB.COM/ALEXEYDEMEDETSKIY/
7A148559C81472A314F7

94. SWIFT

95. 🍕 🛠
🌌

96. 💻

97. 💻
HTTPS://GITHUB.COM/XNEKOIX/FUNTIONALMVP

98. HTTP://WWW.AMAZON.COM/WORKING-EFFECTIVELY-
LEGACY-MICHAEL-FEATHERS/DP/0131177052

99. HTTP://WWW.AMAZON.COM/EXTREME-PROGRAMMING-
EXPLAINED-EMBRACE-EDITION/DP/0321278658

100. QUESTIONS:
@DALOOG
DALOG@ME.COM
NOBIDON