Tests for #4 issue

[grigoriev-semyon]

No description provided.

[github-actions]

✅ Result of Pytest Coverage

---------- coverage: platform linux, python 3.10.8-final-0 -----------

Name	Stmts	Miss	Cover
auth_backend/init.py	0	0	100%
auth_backend/main.py	4	4	0%
auth_backend/auth_plugins/init.py	3	0	100%
auth_backend/auth_plugins/auth_method.py	33	2	94%
auth_backend/auth_plugins/email.py	113	12	89%
auth_backend/base.py	12	4	67%
auth_backend/exceptions.py	15	2	87%
auth_backend/models/init.py	3	0	100%
auth_backend/models/base.py	13	4	69%
auth_backend/models/db.py	31	0	100%
auth_backend/routes/init.py	3	0	100%
auth_backend/routes/base.py	17	3	82%
auth_backend/routes/exc_handlers.py	23	3	87%
auth_backend/routes/logout.py	19	0	100%
auth_backend/settings.py	19	0	100%
auth_backend/utils/init.py	0	0	100%
auth_backend/utils/smtp.py	25	20	20%
TOTAL	333	54	84%
=========================	8	passed,	7