How to use xcodebuild with -only-testing and -skip-testing flag?

Question

I\'ve noticed that there are two options in xcodebuild\'s man page.

-only-testing:TEST-IDENTIFIER       

constr

Answer 1

To test an application you need to go with the two steps:

1. build the application

    xcodebuild build-for-testing \
        -workspace "" \
        -scheme "" \
        -destination "platform=iOS Simulator,name=,OS=" \
        -derivedDataPath "All"

2. test it without building

    xcodebuild test-without-building \
        -xctestrun "All/Build/Products/_iphonesimulator-x86_64.xctestrun" \
        -destination "platform=iOS Simulator,name=,OS=" '-only-testing:'  \
        -derivedDataPath 'build/reports/'

Here, indicates the TEST-IDENTIFIER that means
How many categories or how many test cases under a category you want to run, that should be included under a test bundle[]