✅(tests) test dimail setup command

Test (and slightly improve) dimail setup command,
which populate database on local dimail container

src/backend/mailbox_manager/management/commands/setup_dimail_db.py

@@ -7,6 +7,9 @@ from django.core.management.base import BaseCommand, CommandError
 import requests
 from rest_framework import status
 
+from mailbox_manager.enums import MailDomainStatusChoices
+from mailbox_manager.models import MailDomain
+
 User = get_user_model()
 
 
@@ -48,16 +51,21 @@ class Command(BaseCommand):
             perms=["new_domain", "create_users", "manage_users"],
         )
 
+        # we create a domain and add John Doe to it
+        domain_name = "test.domain.com"
+        if not MailDomain.objects.filter(name=domain_name).exists():
+            MailDomain.objects.create(
+                name=domain_name, status=MailDomainStatusChoices.ENABLED
+            )
+        self.create_domain(domain_name)
+
         # we create a dimail user for keycloak+regie user John Doe
         # This way, la Régie will be able to make request in the name of
         # this user
-        people_base_user = User.objects.get(name="John Doe")
-        self.create_user(name=people_base_user.sub, password="whatever")  # noqa S106
-
-        # we create a domain and add John Doe to it
-        domain_name = "test.domain.com"
-        self.create_domain(domain_name)
-        self.create_allows(people_base_user.sub, domain_name)
+        people_base_user = User.objects.filter(name="John Doe")
+        if people_base_user.exists():
+            self.create_user(name=people_base_user.sub, password="whatever")  # noqa S106
+            self.create_allows(people_base_user.sub, domain_name)
 
         self.stdout.write("DONE", ending="\n")