Re-instate test to satisfy coverage

mail/tests/libraries/test_helpers.py

@@ -0,0 +1,12 @@
+import unittest
+from unittest import mock
+
+from mail.libraries.helpers import log_to_sentry
+
+
+class TestLogToSentry(unittest.TestCase):
+
+    @mock.patch("sentry_sdk.capture_message")
+    def test_log_to_sentry(self, mock_capture_message):
+        log_to_sentry("some message", {"extra": "context"}, level="debug")
+        mock_capture_message.assert_called_with("some message", level="debug")