functests: Replace execute with either command or feed_command

Hope this will make people using feed_command less likely: this hides bugs.
Already found at least two:

1. msgpackparse() will show internal error: hash_add() in case of duplicate
   keys, though it will still work correctly. Currently silenced.
2. ttimeoutlen was spelled incorrectly, resulting in option not being set when
   expected. Test was still functioning somehow though. Currently fixed.

1 files changed, 3 insertions, 4 deletions

diff --git a/test/functional/legacy/glob2regpat_spec.lua b/test/functional/legacy/glob2regpat_spec.lua
index 82e7e3010f..1f9410d87e 100644
--- a/test/functional/legacy/glob2regpat_spec.lua
+++ b/test/functional/legacy/glob2regpat_spec.lua
@@ -1,16 +1,15 @@
 -- Tests for signs
 
 local helpers = require('test.functional.helpers')(after_each)
-local clear, execute = helpers.clear, helpers.execute
+local clear, exc_exec = helpers.clear, helpers.exc_exec
 local eq, neq, eval = helpers.eq, helpers.neq, helpers.eval
 
 describe('glob2regpat()', function()
   before_each(clear)
 
   it('handles invalid input', function()
-    execute('call glob2regpat(1.33)')
-    helpers.feed('<cr>')
-    neq(nil, string.find(eval('v:errmsg'), '^E806:'))
+    eq('Vim(call):E806: using Float as a String',
+       exc_exec('call glob2regpat(1.33)'))
   end)
   it('returns ^$ for empty input', function()
     eq('^$', eval("glob2regpat('')"))