LEVERAGING XCODE

CODE COVERAGESIMONE CIVETTA -

THURSDAY, 8TH OCTOBER

ENTRETEMPS...

CODE COVERAGE

WHAT IS CODE COVERAGE?

TESTING

METRIC THAT MEASURES THE

VALUEOF YOUR

TESTS

CODE COVERAGE DETECTS

> Which code is executing when we're running the tests> Which code is untested

HOW DOES IT WORK?> The information is gathered in two steps

1. compile time 2. runtime

> Tools count each expression that is executed

CODE COVERAGE ON IOS

CODE COVERAGE ON IOSUNTIL LAST MONTH

OBJECTIVE-C

SWIFT

HOW IT WORKED

1. LLVM CREATES ANNOTATION FILES.gcno

gcc -ftest-coverage

2. LLVM CREATES DATA FILES.gcda

gcc -fprofile-arcs

HOW TO ENABLE IN XCODE

HOW TO ENABLEVIA COMMAND LINE

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

TOOLS

TOOLS

> Coverstory> gcovr

> lcov> Slather

SLATHER

Exports to: - HTML

- Gutter JSON- Cobertura XML

github.com/venmo/Slather

BUT, ALSO

SWIFTCOV

swiftcovgithub.com/realm/SwiftCov

> Supports gcov format> Uses breakpoints to gather coverage data

CODE COVERAGE ON IOS

CODE COVERAGE ON IOSSINCE LAST MONTH

OBJECTIVE-C

SWIFT

A NEW FORMAT> gcov

> profdata

XCODE GENERATES profdata FILES FOR

> Swift> ...and Objective-C

HOW TO ENABLE IN XCODE

HOW TO ENABLEVIA COMMAND LINE

xcodebuild [...] test -enableCodeCoverage YES

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

EXPLOITING THE DATA> llvm-cov

> llvm-cov show

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

TOOLS

TOOLS

> Slather> Xcode Server

SLATHER

github.com/venmo/slather/pull/92

XCODE SERVER

SUMMING UP

DOESN'T TELL YOU IF YOUR CODE IS

BAD...

DOESN'T TELL YOU IF YOUR CODE IS

BADBUT CAN HELP WRITING

BETTER CODE

YOU'RE JUSTMINUTES AWAY

FROM COLLECTINGCODE COVERAGE

INFO FOR SWIFTSTART SOON!

THANK YOU

Simone Civetta@viteinfinite

XEBICON