Add tests for EmailTemplate and NotificationLog models

Introduced comprehensive unit tests for EmailTemplate and NotificationLog, including creation, field validation, and custom methods. Added relevant test fixtures to support these models and expanded `conftest.py` for reusability. Validates functionality and maintains model integrity.

backend/tests/test_notification_log.py

@@ -0,0 +1,105 @@
+# tests/models/test_notification_log.py
+import uuid
+from datetime import datetime, timezone
+from app.models.notification_log import NotificationLog, NotificationType, NotificationStatus
+
+
+def test_create_notification_log(db_session, email_template_fixture, guest_fixture):
+    # Arrange
+    notification_log = NotificationLog(
+        id=uuid.uuid4(),
+        notification_type=NotificationType.SMS,
+        status=NotificationStatus.QUEUED,
+        subject="Event Reminder",
+        content_preview="Don't forget the event!",
+        template_id=email_template_fixture.id,
+        event_id=guest_fixture.event_id,
+        guest_id=guest_fixture.id,
+        recipient="+1234567890",
+        notification_metadata={"provider": "Twilio", "priority": "High"},
+    )
+    db_session.add(notification_log)
+
+    # Act
+    db_session.commit()
+    created_log = db_session.query(NotificationLog).filter_by(id=notification_log.id).first()
+
+    # Assert
+    assert created_log is not None
+    assert created_log.notification_type == NotificationType.SMS
+    assert created_log.status == NotificationStatus.QUEUED
+    assert created_log.subject == "Event Reminder"
+    assert created_log.content_preview == "Don't forget the event!"
+    assert created_log.template_id == email_template_fixture.id
+    assert created_log.event_id == guest_fixture.event_id
+    assert created_log.guest_id == guest_fixture.id
+    assert created_log.recipient == "+1234567890"
+    assert created_log.notification_metadata == {"provider": "Twilio", "priority": "High"}
+
+
+def test_mark_sent(notification_log_fixture):
+    # Act
+    notification_log_fixture.mark_sent()
+
+    # Assert
+    assert notification_log_fixture.status == NotificationStatus.SENT
+    assert notification_log_fixture.sent_at is not None
+    assert notification_log_fixture.sent_at < datetime.now(timezone.utc)
+
+
+def test_mark_delivered(notification_log_fixture):
+    # Act
+    notification_log_fixture.mark_delivered()
+
+    # Assert
+    assert notification_log_fixture.status == NotificationStatus.DELIVERED
+    assert notification_log_fixture.delivered_at is not None
+    assert notification_log_fixture.delivered_at < datetime.now(timezone.utc)
+
+
+def test_mark_opened(notification_log_fixture):
+    # Act
+    notification_log_fixture.mark_opened()
+
+    # Assert
+    assert notification_log_fixture.status == NotificationStatus.OPENED
+    assert notification_log_fixture.opened_at is not None
+    assert notification_log_fixture.opened_at < datetime.now(timezone.utc)
+
+
+def test_mark_failed(notification_log_fixture):
+    # Act
+    notification_log_fixture.mark_failed("Undeliverable address")
+
+    # Assert
+    assert notification_log_fixture.status == NotificationStatus.FAILED
+    assert notification_log_fixture.error_message == "Undeliverable address"
+    assert notification_log_fixture.retry_count == 1
+
+
+def test_can_retry_property(notification_log_fixture):
+    # Arrange
+    notification_log_fixture.retry_count = 2
+    notification_log_fixture.status = NotificationStatus.FAILED  # Ensure initial FAILED status
+
+    # Act: Call mark_failed and inspect retry_count/state
+    notification_log_fixture.mark_failed("Temporary issue")
+
+    # Assert: Still retryable since retry_count < 3
+    assert notification_log_fixture.retry_count == 3  # Ensure retry_count incremented
+    assert notification_log_fixture.status == NotificationStatus.FAILED  # Ensure status is 'FAILED'
+    assert notification_log_fixture.can_retry is False  # Now retries are exhausted
+
+    # Reset retry count and revalidate
+    notification_log_fixture.retry_count = 1
+    can_retry = notification_log_fixture.can_retry
+    assert can_retry is True  # Should be retryable with retry_count = 1
+
+
+
+def test_repr_method(notification_log_fixture):
+    # Act
+    repr_output = repr(notification_log_fixture)
+
+    # Assert
+    assert repr_output == f"<NotificationLog {notification_log_fixture.notification_type.value} to {notification_log_fixture.recipient} status={notification_log_fixture.status.value}>"