✅(oidc) add IdP e2e test for login

This is a simple test to assert a user can login via people when setup
as an identity provider.

src/backend/demo/management/commands/create_demo.py

@@ -9,6 +9,7 @@ from uuid import uuid4
 
 from django import db
 from django.conf import settings
+from django.contrib.auth.hashers import make_password
 from django.core.management.base import BaseCommand, CommandError
 from django.utils.text import slugify
 
@@ -20,7 +21,7 @@ from core import models
 
 from demo import defaults
 from mailbox_manager import models as mailbox_models
-from mailbox_manager.enums import MailDomainStatusChoices
+from mailbox_manager.enums import MailboxStatusChoices, MailDomainStatusChoices
 
 fake = Faker()
 
@@ -153,6 +154,29 @@ def create_oidc_people_idp_client():
         application.save()
 
 
+def create_oidc_people_idp_client_user():
+    """Provide a user for the People Identity Provider OIDC client."""
+    organization, _created = models.Organization.objects.get_or_create(
+        name="13002526500013",
+        registration_id_list=["13002526500013"],
+    )
+    mail_domain, _created = mailbox_models.MailDomain.objects.get_or_create(
+        name="example.com",
+        organization=organization,
+        status=MailDomainStatusChoices.ENABLED,
+        support_email="support@example.com",
+    )
+    _mailbox, _created = mailbox_models.Mailbox.objects.get_or_create(
+        first_name="IdP User",
+        last_name="E2E",
+        domain=mail_domain,
+        local_part="user-e2e",
+        status=MailboxStatusChoices.ENABLED,
+        password=make_password("password-user-e2e"),
+        secondary_email="not-used@example.com",
+    )
+
+
 def create_demo(stdout):  # pylint: disable=too-many-locals
     """
     Create a database with demo data for developers to work in a realistic environment.
@@ -337,7 +361,9 @@ def create_demo(stdout):  # pylint: disable=too-many-locals
 
     # OIDC configuration
     if settings.OAUTH2_PROVIDER.get("OIDC_ENABLED", False):
+        stdout.write("Creating OIDC client for People Identity Provider")
         create_oidc_people_idp_client()
+        create_oidc_people_idp_client_user()
 
 
 class Command(BaseCommand):