patch 7.4.2086
Problem:    Using the system default encoding makes tests unpredictable.
Solution:   Always use utf-8 or latin1 in the new style tests.  Remove setting
            encoding and scriptencoding where it is not needed.
diff --git a/src/testdir/test_alot_utf8.vim b/src/testdir/test_alot_utf8.vim
index 8824ee5..049251f 100644
--- a/src/testdir/test_alot_utf8.vim
+++ b/src/testdir/test_alot_utf8.vim
@@ -1,7 +1,8 @@
 " A series of tests that can run in one Vim invocation.
 " This makes testing go faster, since Vim doesn't need to restart.
 
-" These tests use utf8 'encoding'.  Setting 'encoding' is in the individual
+" These tests use utf8 'encoding'.  Setting 'encoding' is already done in
+" runtest.vim.  Checking for the multi_byte feature is in the individual
 " files, so that they can be run by themselves.
 
 source test_expr_utf8.vim