Découvrir une nouvelle fonctionnalité de Xcode 7 : La mesure de la couverture du code par les tests unitaires. Au moment où la taille et la complexité du code grandit, le sujet de la qualité du code et de sa maintenance devient essentiel.

1. LEVERAGING XCODE
CODE COVERAGE
SIMONE CIVETTA -
THURSDAY, 8TH OCTOBER

4. ENTRETEMPS...

10. CODE COVERAGE

11. WHAT IS CODE COVERAGE?

12. TESTING

13. METRIC THAT MEASURES THE
VALUEOF YOUR
TESTS

14. CODE COVERAGE DETECTS
> Which code is executing when we're running the tests
> Which code is untested

15. HOW DOES IT WORK?
> The information is gathered in two steps
1. compile time
2. runtime
> Tools count each expression that is executed

16. CODE COVERAGE ON IOS

17. CODE COVERAGE ON IOS
UNTIL LAST MONTH

19. OBJECTIVE-C

20. SWIFT

23. HOW IT WORKED

24. 1. LLVM CREATES ANNOTATION FILES
.gcno
gcc -ftest-coverage

25. 2. LLVM CREATES DATA FILES
.gcda
gcc -fprofile-arcs

26. HOW TO ENABLE IN XCODE

29. HOW TO ENABLE
VIA COMMAND LINE

30. GCC_INSTRUMENT_PROGRAM_FLOW_ARCS=YES
GCC_GENERATE_TEST_COVERAGE_FILES=YES
xcodebuild [...] test

31. TOOLS

32. TOOLS
> Coverstory
> gcovr
> lcov
> Slather

33. SLATHER
Exports to:
- HTML
- Gutter JSON
- Cobertura XML
github.com/venmo/Slather

34. BUT, ALSO

35. SWIFTCOV
swiftcovgithub.com/realm/SwiftCov
> Supports gcov format
> Uses breakpoints to gather coverage data

37. CODE COVERAGE ON IOS

38. CODE COVERAGE ON IOS
SINCE LAST MONTH

40. OBJECTIVE-C

41. SWIFT

42. A NEW FORMAT> gcov
> profdata

43. XCODE GENERATES profdata FILES FOR
> Swift
> ...and Objective-C

44. HOW TO ENABLE IN XCODE

48. HOW TO ENABLE
VIA COMMAND LINE

49. xcodebuild [...] test -enableCodeCoverage YES

50. xcodebuild
-scheme MoDevByProject
-destination "name=iPhone 6,OS=latest"
-enableCodeCoverage YES
test

51. EXPLOITING THE DATA
> llvm-cov
> llvm-cov show

52. HOW TO USE LLVM-COV
$XCODE_PATH/Toolchains/XcodeDefault.xctoolchain/usr/bin/llvm-cov
show
-instr-profile
MY_PROJECT_PROFDATA
MY_PROJECT_BINARY_FILE

54. TOOLS

55. TOOLS
> Slather
> Xcode Server

56. SLATHER
github.com/venmo/slather/pull/92

57. XCODE SERVER

60. SUMMING UP

61. DOESN'T TELL YOU IF YOUR CODE IS
BAD...

63. DOESN'T TELL YOU IF YOUR CODE IS
BADBUT CAN HELP WRITING
BETTER CODE

64. YOU'RE JUST
MINUTES AWAY
FROM COLLECTING
CODE COVERAGE
INFO FOR SWIFTSTART SOON!

65. THANK YOU

66. Simone Civetta
@viteinfinite

67. XEBICON