diff --git a/src/testdir/test_vim9_script.vim b/src/testdir/test_vim9_script.vim
index 2743668..32312b0 100644
--- a/src/testdir/test_vim9_script.vim
+++ b/src/testdir/test_vim9_script.vim
@@ -3154,6 +3154,10 @@
        return 'test'
      enddef
      g:some#name = 'name'
+
+     def some#varargs(a1: string, ...l: list<string>): string
+       return a1 .. l[0] .. l[1]
+     enddef
   END
 
   mkdir('Xdir/autoload', 'p')
@@ -3166,6 +3170,8 @@
   g:some#other = 'other'
   assert_equal('other', g:some#other)
 
+  assert_equal('abc', some#varargs('a', 'b', 'c'))
+
   # upper case script name works
   lines =<< trim END
      vim9script