Launches the application. This call is synchronous and when it returns the application is launched and ready to handle user events. Any failure in the launch sequence is reported as a test failure and halts the test at this point. If the application is already running, this call will first terminate the existing instance to ensure clean state of the launched instance.

Terminates any running instance of the application. If the application has an existing debug session via Xcode, the termination is implemented as a halt via that debug connection. Otherwise, a SIGKILL is sent to the process.

The arguments that will be passed to the application on launch. If not modified, these are the arguments that Xcode will pass on launch. Those arguments can be changed, added to, or removed. Unlike NSTask, it is legal to modify these arguments after the application has been launched. These changes will not affect the current launch session, but will take effect the next time the application is launched.

The environment that will be passed to the application on launch. If not modified, this is the environment that Xcode will pass on launch. Those variables can be changed, added to, or removed. Unlike NSTask, it is legal to modify the environment after the application has been launched. These changes will not affect the current launch session, but will take effect the next time the application is launched.