Detect in test dotations request body error

tests/server/handlers/test_dotations.py

@@ -2,10 +2,11 @@ from functools import partial
 import json
 
 
-def test_dotations(client, headers):
+def test_dotations_request_body_error(client, headers):
     request = {}
 
     response_function = partial(client.post, "dotations", headers=headers)
     response = response_function(data=json.dumps(request))
 
     assert response.status_code == 400
+    assert "Error" in json.loads(response.data)