Switch the AppVeyor clone directory to C:\testplugin

test/vimrc

@@ -6,7 +6,7 @@ let g:ale_set_lists_synchronously = 1
 " Load builtin plugins
 " We need this because run_vim.sh sets -i NONE
 if has('win32')
-    set runtimepath=$VIM/vimfiles,$VIMRUNTIME,$VIM/vimfiles/after,C:\vader,C:\projects\ale
+    set runtimepath=$VIM/vimfiles,$VIMRUNTIME,$VIM/vimfiles/after,C:\vader,C:\testplugin
 else
     set runtimepath=/home/vim,$VIM/vimfiles,$VIMRUNTIME,$VIM/vimfiles/after,/testplugin,/vader
 endif