patch 7.4.1735
Problem:    It is not possible to only see part of the message history.  It is
            not possible to clear messages.
Solution:   Add a count to ":messages" and a clear argument. (Yasuhiro
            Matsumoto)
diff --git a/src/testdir/test_alot.vim b/src/testdir/test_alot.vim
index 7f9a1a7..d393fe7 100644
--- a/src/testdir/test_alot.vim
+++ b/src/testdir/test_alot.vim
@@ -17,6 +17,7 @@
 source test_lispwords.vim
 source test_matchstrpos.vim
 source test_menu.vim
+source test_messages.vim
 source test_partial.vim
 source test_reltime.vim
 source test_searchpos.vim