✅(tests) test dimail setup command

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

src/backend/mailbox_manager/tests/test_command_dimail_setup_db.py

@@ -0,0 +1,69 @@
+"""Test the `setup_dimail_db` management command"""
+
+from django.conf import settings
+from django.contrib.auth import get_user_model
+from django.core.management import call_command
+
+import pytest
+import requests
+
+from mailbox_manager.management.commands.setup_dimail_db import DIMAIL_URL, admin
+
+pytestmark = pytest.mark.django_db
+
+admin_auth = (admin["username"], admin["password"])
+User = get_user_model()
+
+
+@pytest.mark.skipif(
+    settings.DEBUG is not True,
+    reason="Run only in local (dimail container not running in other envs)",
+)
+def test_commands_setup_dimail_db():
+    """The create_demo management command should create objects as expected."""
+    call_command("setup_dimail_db")
+
+    # check created users
+    response = requests.get(url=f"{DIMAIL_URL}/users/", auth=admin_auth, timeout=10)
+    users = response.json()
+
+    # if John Doe exists, we created a dimail user for them
+    local_user = User.objects.filter(name="John Doe").exists()
+
+    assert len(users) == 3 if local_user else 2
+    # remove uuid because we cannot devine them
+    [user.pop("uuid") for user in users]  # pylint: disable=W0106
+
+    if local_user:
+        assert users.pop() == {
+            "is_admin": False,
+            "name": User.objects.get(name="John Doe").uuid,
+            "perms": [],
+        }
+    assert users == [
+        {
+            "is_admin": True,
+            "name": "admin",
+            "perms": [],
+        },
+        {
+            "is_admin": False,
+            "name": "la_regie",
+            "perms": [
+                "new_domain",
+                "create_users",
+                "manage_users",
+            ],
+        },
+    ]
+
+    # check created domains
+    response = requests.get(url=f"{DIMAIL_URL}/domains/", auth=admin_auth, timeout=10)
+    domains = response.json()
+    assert len(domains) == 1
+    assert domains[0]["name"] == "test.domain.com"
+
+    # check created allows
+    response = requests.get(url=f"{DIMAIL_URL}/allows/", auth=admin_auth, timeout=10)
+    allows = response.json()
+    assert len(allows) == 2 if local_user else 1