# Test for sync block without inputs doesn´t stop

**URL:** <https://www.ruby-forum.com/t/test-for-sync-block-without-inputs-doesn-t-stop/231524>\
**Category:** GNU Radio\
**Created:** [August 13, 2014, 11:26am UTC](https://www.ruby-forum.com/t/test-for-sync-block-without-inputs-doesn-t-stop/231524 "2014-08-13T11:26:30Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![addis\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/c4cdca/32.png) [@addis\_a](https://www.ruby-forum.com/u/addis_a)\
**Post date:** [August 13, 2014, 11:26am UTC](https://www.ruby-forum.com/t/test-for-sync-block-without-inputs-doesn-t-stop/231524/1 "2014-08-13T11:26:30Z")

</div>

Hello!

I’m trying to make a test for a GNUradio sync block without inputs. When  
I run the python qa-test it doesn’t stop, it just loops forever. When I  
add an input to the block (change the io-signature and xml-file) the  
test only runs once and then stops.

Is this behavoiur as it should be?  
How can I make a test that terminates?