patch 7.4.2164
Problem:    It is not possible to use plugins in an "after" directory to tune
            the behavior of a package.
Solution:   First load plugins from non-after directories, then packages and
            finally plugins in after directories.
            Reset 'loadplugins' before executing --cmd arguments.
diff --git a/src/testdir/setup.vim b/src/testdir/setup.vim
index f7e475a..dee3de2 100644
--- a/src/testdir/setup.vim
+++ b/src/testdir/setup.vim
@@ -1,7 +1,8 @@
 " Common preparations for running tests.
 
-" Make sure 'runtimepath' does not include $HOME.
+" Make sure 'runtimepath' and 'packpath' does not include $HOME.
 set rtp=$VIM/vimfiles,$VIMRUNTIME,$VIM/vimfiles/after
+let &packpath = &rtp
 
 " Only when the +eval feature is present. 
 if 1