diff --git a/src/testdir/test_options.vim b/src/testdir/test_options.vim
index 636a24d..7a74af6 100644
--- a/src/testdir/test_options.vim
+++ b/src/testdir/test_options.vim
@@ -44,7 +44,7 @@
   set wildchar&
 endfunc
 
-func Test_options()
+func Test_options_command()
   let caught = 'ok'
   try
     options
@@ -388,6 +388,13 @@
   set tw& iskeyword& splitbelow&
 endfunc
 
+func Test_set_one_column()
+  let out_mult = execute('set all')->split("\n")
+  let out_one = execute('set! all')->split("\n")
+  " one column should be two to four times as many lines
+  call assert_inrange(len(out_mult) * 2, len(out_mult) * 4, len(out_one))
+endfunc
+
 func Test_set_values()
   if filereadable('opt_test.vim')
     source opt_test.vim