diff --git a/test/diff/_idindex_ b/test/diff/_idindex_
new file mode 100644
index 000000000..53040afc4
--- /dev/null
+++ b/test/diff/_idindex_
@@ -0,0 +1,12 @@
+--- https://datatracker.ietf.org/public/idindex.cgi 
++++ /idindex/ 
+@@ -16,1 +16,0 @@
+-I-D Exists
+@@ -545,2 +544,2 @@
+-RFC EDITOR
+-TOOLS
++RFC Editor
++Tools
+@@ -555,1 +554,1 @@
+-Author: Last Name First Name
++Author: Last name First name
\ No newline at end of file