Good day everyone, I stuck in testing my custom module using odoo 12. 

my_module -> models ->__init__.py(from . import sample), sample.py (_name='sample.sample')

my_module -> tests -> __init__.py(from . import test_module), test_module.py

Inside my test_module:

from odoo.tests.common import TransactionCase

import logging

_logger = logging.getLogger(__name__)

_logger.warn('Before Class')

class TestModule(TransactionCase):

        _logger.warn('Inside Class')

        def test_module(self):

            _logger.warn('Method Executed')

        def setUp(self):
            super(TestModule,self).setUp()

            _logger.warn('Method Executed in setUp')

In my run config: --addons-path="path"   --config=path -d my_db -i my_module --test-enable

When I run it, the 'Before class' and 'Inside class' displayed. Then when I tried it using odoo 10, everything works fine, but not in 12. Why the methods did not called by the system?