This commit add some tests related to the mail gateway: more bounce management
tests and some additional thread formation tests. Some test asserts about
bounce / blacklist management are commented as they are not completely working
currently. This will be improved in master soon.
Some cleaning in also done in all mail gateway tests. Notably some call to
tool methods are cleaned / simplified, duplicate tests are removed. Some
low-level checks are removed.
A new test model is added for mail gateway: mail.test.gateway. It is a
chatter model with blacklist enabled on it. It allows to tests the
various blacklist-related overrides and features as well as all basic
mail gateway features.
Sub-part of task 1853147 (pre-cleaning before implementing mail gateway
improvements)
Linked to PR #32974
Thibault Delavallée
e87189222d