tests/test-config.t

--- a/tests/test-config.t	Sun Feb 19 01:00:10 2017 +0900
+++ b/tests/test-config.t	Sun Feb 19 01:16:45 2017 +0900
@@ -158,3 +158,9 @@
   $ hg showconfig paths
   paths.foo:suboption=~/foo
   paths.foo=$TESTTMP/foo
+
+edit failure
+
+  $ HGEDITOR=false hg config --edit
+  abort: edit failed: false exited with status 1
+  [255]