diff --git a/tests/test-extension.t b/tests/test-extension.t
--- a/tests/test-extension.t
+++ b/tests/test-extension.t
@@ -1423,7 +1423,8 @@
   ** Mercurial Distributed SCM * (glob)
   ** Extensions loaded: throw
 
-empty declaration of supported version, extension complains:
+empty declaration of supported version, extension complains (but doesn't choke if
+the value is improperly a str instead of bytes):
   $ echo "testedwith = ''" >> throw.py
   $ hg --config extensions.throw=throw.py throw 2>&1 | egrep '^\*\*'
   ** Unknown exception encountered with possibly-broken third-party extension throw
@@ -1434,7 +1435,8 @@
   ** Mercurial Distributed SCM (*) (glob)
   ** Extensions loaded: throw
 
-If the extension specifies a buglink, show that:
+If the extension specifies a buglink, show that (but don't choke if the value is
+improperly a str instead of bytes):
   $ echo 'buglink = "http://example.com/bts"' >> throw.py
   $ rm -f throw.pyc throw.pyo
   $ rm -Rf __pycache__