Issue 228 fix spurious timeout after stop on silence

byexample/modules/shell.py

@@ -206,12 +206,19 @@ def _run_impl(self, example, options):
                         "Unexpected stop-signal '%s'" % stop_signal
                     )
 
+                if stop_on_silence:
+                    options.up({'stop_on_silence': False})
+
                 # wait for the prompt, ignore any extra output
-                self._expect_prompt(
-                    options,
-                    countdown=Countdown(options['x']['dfl_timeout']),
-                    prompt_re=self._PS1_re
-                )
+                try:
+                    self._expect_prompt(
+                        options,
+                        countdown=Countdown(options['x']['dfl_timeout']),
+                        prompt_re=self._PS1_re
+                    )
+                finally:
+                    if stop_on_silence:
+                        options.down()
 
                 self._drop_output()
                 return out

test/corner_cases.md

@@ -184,6 +184,14 @@ $ byexample -m test/ds/submod -l python -q test/ds/one.md
 
 ## Shutdown
 
+Ensure that if the program is slow and takes some reasonable time to
+shutdown, don't raise a Timeout after stopping it
+
+```shell
+$ test/ds/sleepy/c.sh          # byexample: +timeout=10 +stop-on-silence +stop-signal=interrupt
+Start
+```
+
 Run three very slow tests and send `byexample` to the background
 as soon as possible.
 

test/ds/sleepy/c.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+trap 'echo INT ; sleep 2 ; echo Bye' INT
+echo Start
+sleep 3
+echo BOOM