diff --git a/app/tests/conftest.py b/app/tests/conftest.py
index 872daf1..905629c 100644
--- a/app/tests/conftest.py
+++ b/app/tests/conftest.py
@@ -7,6 +7,7 @@
 @pytest.fixture(scope="function")
 def client(request):
     os.environ["ENV"] = "TEST"
+    os.environ["TEST_HEADER"] = "x-unicodeapi-test"
     from app.main import app
 
     with TestClient(app) as client: