[tbot] Handling return code from test case

[Stefano Babic]

Hi,

I am trying two simple testcases:

- first testcase boots a board in Linux and run an existing command
- second testcase boots a board in Linux and run a not existing command

As desired, tbot reports success for the first one and failure for the
second one.

But let's say I want to test that a command fails, that is my tbot
testcase should be successful if the command is not found.

When I call exec0, test of course fails but tbot stops. How is this
managed ?

Just to make things clear:

import contextlib
 import typing
 import time
 import tbot
 from tbot.machine import linux

 @tbot.testcase
 def missingcmd(
     mach: typing.Optional[linux.LinuxMachine] = None,
 ) -> None:
     with contextlib.ExitStack() as cx:
         if mach is None:
             lh = cx.enter_context(tbot.acquire_lab())
             b = cx.enter_context(tbot.acquire_board(lh))
             lnx = cx.enter_context(tbot.acquire_linux(b))
         else:
             lnx = mach

         lnx.exec0("doesnotexist")


And tbot should be successful if the command cannot be executed (also, I
want a "reverse" case).

Regards,
Stefano

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