Feat/test identity models

[AAdewunmi]

Summary

Adds test support and coverage for StudyBuddy identity models.

Changes

• Added factories for custom users and roles.
• Added common role traits for student, tutor, and admin.
• Added user factory support for role assignments.
• Added model tests for email-first user behavior.
• Added model tests for role display names, unique slugs, and common role traits.
• Updated factories to use the project’s real role relationship, user.studybuddy_roles.
• Used factory.django.Password for realistic hashed user passwords.

Behavior

Tests can now create realistic users and roles from the start, including common role assignments used for future access-control behavior.

Why

Identity and permission behavior will sit underneath dashboard and feature access. These factories and tests make that baseline easier to verify without scattering setup details or hard-coded role data through future tests.

Validation

• docker compose exec web python -m black . --check
• docker compose exec web python -m ruff check .
• docker compose exec web pytest apps/users/tests/test_models.py apps/roles/tests/test_models.py -q
• docker compose exec web pytest -q

Result

All validation passes. The full test suite reports 25 passed.

Notes

The common role traits are intentionally lightweight. They provide stable test setup until formal permission rules are introduced.

[codecov]

Codecov Report

❌ Patch coverage is 98.82353% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
apps/users/factories.py	95.45%	1 Missing ⚠️

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