--- a/tests/common-pattern.py	Sat Dec 02 20:03:28 2017 -0500
+++ b/tests/common-pattern.py	Wed Nov 29 23:20:52 2017 -0500
@@ -3,7 +3,7 @@
 
 substitutions = [
     # list of possible compressions
-    (br'zstd,zlib,none,bzip2',
+    (br'(zstd,)?zlib,none,bzip2',
      br'$USUAL_COMPRESSIONS$'
     ),
     # capabilities sent through http