diff --git a/.coveragerc b/.coveragerc
new file mode 100644
index 0000000..f227e0f
--- /dev/null
+++ b/.coveragerc
@@ -0,0 +1,2 @@
+[run]
+source = selfprivacy_api
\ No newline at end of file
diff --git a/tests/services/test_mailserver.py b/tests/services/test_mailserver.py
index f45ad1e..a9e5f12 100644
--- a/tests/services/test_mailserver.py
+++ b/tests/services/test_mailserver.py
@@ -2,12 +2,6 @@ import base64
 import json
 import pytest
 
-
-def read_json(file_path):
-    with open(file_path, "r", encoding="utf-8") as f:
-        return json.load(f)
-
-
 ###############################################################################