tests/test-install.t

--- a/tests/test-install.t	Sun Sep 10 23:37:14 2017 +0900
+++ b/tests/test-install.t	Thu Sep 07 22:27:23 2017 +0900
@@ -76,6 +76,11 @@
   1 problems detected, please check your install!
   [1]
 
+hg debuginstall with invalid encoding
+  $ HGENCODING=invalidenc hg debuginstall | grep encoding
+  checking encoding (invalidenc)...
+   unknown encoding: invalidenc
+
 path variables are expanded (~ is the same as $TESTTMP)
   $ mkdir tools
   $ touch tools/testeditor.exe