This commit adds a test suite for the views defined in
managemails.views. One issue discovered when writing tests is fixed by
checking the request method in CreateMailbox.dispatch.
This commit adds tests for managemails.models to improve the test
coverage of that model. There are some changes to the classes in
managemails.models too:
- add a method create_mailbox to MailboxManager
- properly handle uncommited mailaddresses in MailAddress.set_mailbox
and MailAddress.set_forward_addresses
This commit adds tests for managemails.forms. A refactoring TODO is
added to MailAddressFieldMixin and pragma: no cover has been added to
code paths not reachable if no new constants are added to the
MAILBOX_OR_FORWARDS constant array.
