Update trigger_source test to catch bugs like #21
Update trigger_source test to catch bugs like #21

Dallinger/Dallinger,jcpeterson/Dallinger,berkeley-cocosci/Wallace,jcpeterson/Dallinger,Dallinger/Dallinger,Dallinger/Dallinger,suchow/Wallace,jcpeterson/Dallinger,Dallinger/Dallinger,jcpeterson/Dallinger,jcpeterson/Dallinger,berkeley-cocosci/Wallace,berkeley-cocosci/Wallace,Dallinger/Dallinger,suchow/Wallace,suchow/Wallace