first commit

backend/tests/test_mail_sender.py

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+from types import SimpleNamespace
+from unittest.mock import patch
+
+from app.services.mail_sender import build_message, sign_message
+
+
+def test_dkim_sign_uses_selector_before_domain():
+    message = build_message(
+        sender="user@ritoesis.com",
+        recipients=["recipient@example.com"],
+        cc=[],
+        subject="Test",
+        body_text="Hello",
+        body_html=None,
+    )
+    domain = SimpleNamespace(
+        domain_name="ritoesis.com",
+        dkim_selector="agmail",
+        dkim_private_key="private-key",
+    )
+
+    with patch(
+        "app.services.mail_sender.dkim.sign",
+        return_value=b"DKIM-Signature: test\r\n",
+    ) as signer:
+        sign_message(message, domain)
+
+    assert signer.call_args.args[1] == b"agmail"
+    assert signer.call_args.args[2] == b"ritoesis.com"