[FIX] survey: fix test failing for duplicated session_code

Surveys cannot be created in batch without `session_code` because it must
be unique across surveys.

Technically, using a 5-digit codes makes it unlikely that
a collision occurs with records created without explicit session_code (see
Survey._get_default_session_code's iterative process).

See runbot 55709
See also related runbot 25041 solved in #159295

Task-3829536

closes odoo/odoo#162587

X-original-commit: 0efbd6e31f5870c1e3004c129e79b9dfa7379863
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>

addons/survey/tests/test_survey.py

@@ -15,8 +15,8 @@ class TestSurveyInternals(common.TestSurveyCommon, MailCase):
     def test_allowed_triggering_question_ids(self):
         # Create 2 surveys, each with 3 questions, each with 2 suggested answers
         survey_1, survey_2 = self.env['survey.survey'].create([
-            {'title': 'Test Survey 1'},
-            {'title': 'Test Survey 2'}
+            {'title': 'Test Survey 1', 'session_code': '10000'},
+            {'title': 'Test Survey 2', 'session_code': '10001'}
         ])
         self.env['survey.question'].create([
             {