fix: User creation through API when signups are supposed to be disabled (#2622)

* fix user creation when signups are supposed to be diabled

* add user registration tests

* run formatter

* fix test filename

---------

Co-authored-by: Michael Genson <71845777+michael-genson@users.noreply.github.com>

tests/integration_tests/user_tests/test_user_registration.py

@@ -0,0 +1,34 @@
+import random
+import string
+
+from fastapi.testclient import TestClient
+from mealie.core.config import get_app_settings
+from tests.utils import api_routes
+from tests.utils.factories import user_registration_factory
+
+
+def test_register_user(api_client: TestClient, monkeypatch):
+    # create random registration
+    registration = user_registration_factory()
+
+    # signup disabled but valid request
+    monkeypatch.setenv("ALLOW_SIGNUP", "False")
+    get_app_settings.cache_clear()
+    response = api_client.post(api_routes.users_register, json=registration.dict(by_alias=True))
+    assert response.status_code == 403
+
+    # signup disabled, request includes non valid group token
+    registration.group_token = "".join(random.choice(string.ascii_lowercase + string.digits) for _ in range(10)).strip()
+    response = api_client.post(api_routes.users_register, json=registration.dict(by_alias=True))
+    assert response.status_code == 400
+
+    # signup enabled but contains non valid group token
+    monkeypatch.setenv("ALLOW_SIGNUP", "True")
+    get_app_settings.cache_clear()
+    response = api_client.post(api_routes.users_register, json=registration.dict(by_alias=True))
+    assert response.status_code == 400
+
+    # signup enabled and valid request
+    registration.group_token = None
+    response = api_client.post(api_routes.users_register, json=registration.dict(by_alias=True))
+    assert response.status_code == 201