diff --git a/README.md b/README.md
index d5d735f..6610bd6 100644
--- a/README.md
+++ b/README.md
@@ -371,3 +371,10 @@ $ lldb `which vim`
 (lldb) r <Enter>
 Ctrl-C q <Enter> <Enter>
 ```
+
+## The test driven development way
+Credit: @axelf4
+
+```vim
+:echom test_null_list()
+```