diff --git a/src/testdir/check.vim b/src/testdir/check.vim
index f176f83..6c3b1be 100644
--- a/src/testdir/check.vim
+++ b/src/testdir/check.vim
@@ -1,3 +1,5 @@
+source shared.vim
+
 " Command to check for the presence of a feature.
 command -nargs=1 CheckFeature call CheckFeature(<f-args>)
 func CheckFeature(name)
@@ -102,3 +104,11 @@
     throw 'Skipped: only works in the terminal'
   endif
 endfunc
+
+" Command to check that test is not running as root
+command CheckNotRoot call CheckNotRoot()
+func CheckNotRoot()
+  if IsRoot()
+    throw 'Skipped: cannot run test as root'
+  endif
+endfunc