[MERGE] various: Make the test suite demo data independant

Purpose
=======

This is the first huge step to improve the test suite in several ways:

- Make them demo data independent, allowing to modify the demo data without having to adapt the tests depending on it. It also allows to have a beautiful + convenient demo dataset to make a demonstration, and to configure complex data in the tests to manage the corner cases.
- Improve the test performances by converting them into SavepointCase. Each test will be rollbacked to it's initial state, after the setUpClass call. That way the different data are not re-created at each test for nothing.
- Introduce several test classes in base/tests/common.py to launch a TransactionCase, HttpCase or SavepointCase test with an available demo user, portal user or a large set of partners.
- This is the first step to tend to a rolling release process, allowing to execute the tests (or a subset of the tests) on a migrated base, for example.

closes odoo/odoo#39868

Taskid: 2075739
Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/odoo/addons/base/tests/test_misc.py b/odoo/addons/base/tests/test_misc.py
index 34bd040eff8..29d0a021558 100644
--- a/odoo/addons/base/tests/test_misc.py
+++ b/odoo/addons/base/tests/test_misc.py
@@ -190,6 +190,7 @@ class TestDateRangeFunction(BaseCase):
 
 class TestFormatLangDate(TransactionCase):
     def test_00_accepted_types(self):
+        self.env.user.tz = 'Europe/Brussels'
         datetime_str = '2017-01-31 12:00:00'
         date_datetime = datetime.datetime.strptime(datetime_str, "%Y-%m-%d %H:%M:%S")
         date_date = date_datetime.date()