I\'ve noticed that there are two options in xcodebuild\'s man page.
-only-testing:TEST-IDENTIFIER
constr
Like what Marcio said, it's a path like string.
For example, say you have a scheme named MyScheme, a test target MyUITests, and testing class LoginTest, then testing method testUserLogin, to run only the method, you can run
xcodebuild -workspace Envoy.xcworkspace \
-scheme MyScheme \
-sdk iphonesimulator \
-destination 'platform=iOS Simulator,name=iPad Air 2,OS=10.1'
'-only-testing:MyUITests/LoginTest/testUserLogin' test
Likewise, if you want to run all tests under LoginTest, here you run
xcodebuild -workspace Envoy.xcworkspace \
-scheme MyScheme \
-sdk iphonesimulator \
-destination 'platform=iOS Simulator,name=iPad Air 2,OS=10.1'
'-only-testing:MyUITests/LoginTest' test