diff --git a/src/testdir/test_assert.vim b/src/testdir/test_assert.vim
index 049ce98..25337a5 100644
--- a/src/testdir/test_assert.vim
+++ b/src/testdir/test_assert.vim
@@ -17,3 +17,8 @@
   let l = [1, 2, 3]
   call assert_equal([1, 2, 3], l)
 endfunc
+
+func Test_user_is_happy()
+  smile
+  sleep 300m
+endfunc