diff --git a/src/testdir/test_bufwintabinfo.vim b/src/testdir/test_bufwintabinfo.vim
index d61670b..43d0473 100644
--- a/src/testdir/test_bufwintabinfo.vim
+++ b/src/testdir/test_bufwintabinfo.vim
@@ -42,6 +42,7 @@
     sign undefine Mark
     enew!
   endif
+  call assert_notequal([], getbufinfo(test_null_dict()))
 
   only
   let w1_id = win_getid()