Init dotations handler's test

tests/server/handlers/test_dotations.py

+from functools import partial
+import json
+
+
+def test_dotations(client, headers):
+    request = {}
+
+    response_function = partial(client.post, "dotations", headers=headers)
+    response = response_function(data=json.dumps(request))
+
+    assert response.status_code == 400