tests/test-histedit-arguments.t

--- a/tests/test-histedit-arguments.t	Mon Jan 07 19:00:54 2019 -0500
+++ b/tests/test-histedit-arguments.t	Wed Jan 09 20:00:35 2019 -0800
@@ -112,6 +112,13 @@
   > pick 08d98a8350f3 4 five
   > EOF
 
+Test invalid config default
+---------------------------
+
+  $ hg histedit --config "histedit.defaultrev="
+  abort: config option histedit.defaultrev can't be empty
+  [255]
+
 Run on a revision not descendants of the initial parent
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