diff --git a/.gitignore b/.gitignore
index ef30f6c..d096524 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,3 +8,4 @@ dist/
 .coverage
 htmlcov/
 build/
+_build/
diff --git a/tests/root/testpage2.rst b/tests/root/testpage2.rst
index f7c3351..f6ecf35 100644
--- a/tests/root/testpage2.rst
+++ b/tests/root/testpage2.rst
@@ -6,3 +6,6 @@ This page contains IP addresses :ip:v4:`127.0.0.1`, :ip:v4:`192.168.0.1` and
 
 There is also :ip:v6range:`2001:dada:b001::/64` and
 :ip:v4range:`172.16.0.0/24`.
+
+The extension should also handle malformed things like :ip:v4:`<IP>`,
+:ip:v6:`<IP6>`, :ip:v4range:`<IPR>` and :ip:v6range:`<IPR6>` properly.