Some additional changes in mail composer tests before going into some rewriting
and improvements
* some improved messages in asserts;
* additional tests for attachments in mass mailing mode, using sub tests;
* additional tests for configuration (auto_delete_* fields, email fields,
subtype, ...);
* removed some wrong tests not failing due to current code: when testing
template values, do not give a creation value at the same time as it
will fail when moving to editable stored fields;
Task-2710804 (Mail: Clean MailThread Posting API)
closesodoo/odoo#109522
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>
Thibault Delavallée
0fcd089a3d