diff --git a/docker-compose.yml b/docker-compose.yml
index 38f311d..5ed7d97 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -23,6 +23,7 @@ services:
       MONGO_INITDB_ROOT_USERNAME: ${PYTHON_MONGO_USERNAME:-root}
       MONGO_INITDB_ROOT_PASSWORD: ${PYTHON_MONGO_PASSWORD:?error}
       MONGO_INITDB_DATABASE: ${PYTHON_MONGO_DATABASE:-transparenzregister}
+      TEST_ENV_VAR: Hello_World
     ports:
     - ${MONGO_EXTERNAL_PORT:-27018}:27017