Travis: kill awesome after max. 60s per test file

This is required for when the test setup fails already, e.g. because of
an assertion error at the top of a test file.

tests/run.sh

@@ -189,6 +189,8 @@ start_awesome() {
 
 # Count errors.
 errors=0
+# Seconds after when awesome gets killed.
+timeout_stale=60
 
 for f in $tests; do
     echo "== Running $f =="
@@ -204,6 +206,13 @@ for f in $tests; do
     # Send the test file to awesome.
     cat $f | DISPLAY=$D "$AWESOME_CLIENT" 2>&1
 
+    # Kill awesome after 1 minute (e.g. with errors during test setup).
+    (sleep $timeout_stale
+      if [ "$(ps -o comm= $awesome_pid)" = "${AWESOME##*/}" ]; then
+        echo "Killing (stale?!) awesome (PID $awesome_pid) after $timeout_stale seconds."
+        kill $awesome_pid
+      fi) &
+
     # Tail the log and quit, when awesome quits.
     tail -n 100000 -f --pid $awesome_pid $awesome_log