CreateTee splits the stdout and stderr in order to capture these streams into a buffer during test execution.

Temporarily unsets the env variables for the test cases returns a function to reset them to their initial values.

PrepareStdinResponse creates a temproary file with a prepared content which then is used as os.Stdin to test user input.

PreventAtExit prevents an early/unexpected termination via atexit.

PreventExitWithNonZeroReturn creates an exit handler function which will cast a veto when the program tries to call os.Exit with a non zero exit code.

ResetStdin resets os.Stdin to the specified original file handle.

SetupTmpMinishiftHome creates a tmp directory and points MINISHIFT_HOME to it.

VerifyExitCodeAndMessage creates an exit handler which verifies that the program will try to exit execution with the specified exit code and message.