diff --git a/src/testdir/test_spell.vim b/src/testdir/test_spell.vim
index 5755146..4e376b8 100644
--- a/src/testdir/test_spell.vim
+++ b/src/testdir/test_spell.vim
@@ -160,6 +160,9 @@
   call assert_equal(['Third'], spellsuggest('THird', 1))
   call assert_equal(['All'],      spellsuggest('ALl', 1))
 
+  call assert_fails("call spellsuggest('maxch', [])", 'E745:')
+  call assert_fails("call spellsuggest('maxch', 2, [])", 'E745:')
+
   set spell&
 endfunc
 
@@ -1164,3 +1167,5 @@
       \"SAL ZZ-                  _",
       \"SAL Z                    S",
       \ ]
+
+" vim: shiftwidth=2 sts=2 expandtab