[travis] update to check if call recording is over 100k

.travis.yml

@@ -39,9 +39,9 @@ script:
   - docker exec -it asterisk1 asterisk -rx 'channel originate PJSIP/333@asterisk2 application playback tt-monkeys'
   # Wait for the call to complete (believe it takes 16 seconds, we'll give it some padding)
   - sleep 20
-  # Check out the size of the call recording (should have a known size.) was with "| grep 131680" but it failed.
-  - docker exec -it asterisk2 /bin/bash -c 'stat -c "%s" /var/spool/asterisk/monitor/test.ulaw'
+  # Check out the size of the call recording (should have a known size. check that it's over 100kB)
   - docker exec -it asterisk2 /bin/bash -c 'ls -l /var/spool/asterisk/monitor/test.ulaw'
+  - docker exec -it asterisk2 /bin/bash -c 'if [ "$(stat -c '%s' /var/spool/asterisk/monitor/test.ulaw)" -lt "100000" ]; then exit 1; fi;'
   # See that the CDR looks ok, that we got a call across.
   - docker exec -it asterisk2 grep -Pi "333.+inbound.+ANSWERED" /var/log/asterisk/cdr-csv/Master.csv