diff --git a/tests/test-notfound b/tests/test-notfound
new file mode 100755
--- /dev/null
+++ b/tests/test-notfound
@@ -0,0 +1,9 @@
+#!/bin/sh
+
+hg init
+
+echo "Is there an error message when trying to diff non-existing files?"
+hg diff not found
+
+echo "Is there an error message when trying to add non-existing files?"
+hg add not found