patch 8.2.2623: some tests fail when run as root
Problem: Some tests fail when run as root.
Solution: Use CheckNotRoot.
diff --git a/src/testdir/test_writefile.vim b/src/testdir/test_writefile.vim
index e7a309a..7256c65 100644
--- a/src/testdir/test_writefile.vim
+++ b/src/testdir/test_writefile.vim
@@ -410,6 +410,9 @@
func Test_write_readonly_dir()
" On MS-Windows, modifying files in a read-only directory is allowed.
CheckUnix
+ " Root can do it too.
+ CheckNotRoot
+
call mkdir('Xdir')
call writefile(['one'], 'Xdir/Xfile1')
call setfperm('Xdir', 'r-xr--r--')