test: Add comprehensive unit test coverage for all domains
This commit adds extensive unit tests across all Django app domains,
increasing test coverage significantly. All tests use mocks to avoid
database dependencies and follow the testing pyramid approach.
Domains covered:
- identity/core: mixins, models, permissions, OAuth, quota service
- identity/users: models, API views, MFA, services
- commerce/tickets: signals, serializers, views, email notifications
- commerce/payments: services, views
- communication/credits: models, tasks, views
- communication/mobile: serializers, views
- communication/notifications: models, serializers, views
- platform/admin: serializers, views
- platform/api: models, views, token security
- scheduling/schedule: models, serializers, services, signals, views
- scheduling/contracts: serializers, views
- scheduling/analytics: views
Key improvements:
- Fixed 54 previously failing tests in signals and serializers
- All tests use proper mocking patterns (no @pytest.mark.django_db)
- Added test factories for creating mock objects
- Updated conftest.py with shared fixtures
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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