Add user service tests for superuser creation

Author: dcloud347

tests/app/services/test_user_service.py

@@ -0,0 +1,25 @@
+import pytest
+
+from prometheus.app.services.database_service import DatabaseService
+from prometheus.app.services.user_service import UserService
+from tests.test_utils.fixtures import postgres_container_fixture
+
+
+@pytest.fixture
+def mock_database_service(postgres_container_fixture):
+    service = DatabaseService(postgres_container_fixture.get_connection_url())
+    service.start()
+    return service
+
+
+def test_create_superuser(mock_database_service):
+    # Exercise
+    service = UserService(mock_database_service)
+    service.create_superuser(
+        "testuser",
+        "test@gmail.com",
+        "password123",
+        github_token="gh_token"
+    )
+
+# TODO test login