By inheriting from a test class that contains test methods, these tests are executed twice. closes odoo/odoo#150272 X-original-commit: 835f600eac6fd1ec202cd21876457b14d3d0af06 Signed-off-by: William Henrotin (whe) <whe@odoo.com> Signed-off-by: Christophe Monniez (moc) <moc@odoo.com>