Command is like exec.Command, but applies the same changes as testenv.CommandContext (with a default Context).

CommandContext is like exec.CommandContext, but: - skips t if the platform does not support os/exec, - sends SIGQUIT (if supported by the platform) instead of SIGKILL in its Cancel function - if the test has a deadline, adds a Context timeout and WaitDelay for an arbitrary grace period before the test's deadline expires, - fails the test if the command does not complete before the test's deadline, and - sets a Cleanup function that verifies that the test did not leak a subprocess.

Sigquit is the signal to send to kill a hanging subprocess.