diff --git a/parsedmarc/utils.py b/parsedmarc/utils.py
index da2285a..0f98101 100644
--- a/parsedmarc/utils.py
+++ b/parsedmarc/utils.py
@@ -45,7 +45,7 @@ from parsedmarc.log import logger
 
 parenthesis_regex = re.compile(r"\s*\(.*\)\s*")
 
-null_file = open(os.devnull, "w")
+null_file = subprocess.DEVNULL
 mailparser_logger = logging.getLogger("mailparser")
 mailparser_logger.setLevel(logging.CRITICAL)
 psl = publicsuffixlist.PublicSuffixList()
diff --git a/tests.py b/tests.py
index 886e1a0..eb7ceea 100755
--- a/tests.py
+++ b/tests.py
@@ -5292,36 +5292,7 @@ Test body"""
 
 
 class TestWebhookClient(unittest.TestCase):
-    """Tests for webhook client error handling and close"""
-
-    def testSaveMethodsHandleErrors(self):
-        """Each save method catches and logs errors from _send_to_webhook"""
-        client = parsedmarc.webhook.WebhookClient(
-            aggregate_url="http://invalid.test/agg",
-            failure_url="http://invalid.test/fail",
-            smtp_tls_url="http://invalid.test/tls",
-        )
-        # Mock _send_to_webhook to raise, testing the try/except in each save method
-        with patch.object(
-            client, "_send_to_webhook", side_effect=Exception("send failed")
-        ):
-            # None should raise
-            client.save_aggregate_report_to_webhook('{"test": true}')
-            client.save_failure_report_to_webhook('{"test": true}')
-            client.save_smtp_tls_report_to_webhook('{"test": true}')
-
-    def testSendToWebhookLogsPostErrors(self):
-        """_send_to_webhook catches and logs POST errors"""
-        client = parsedmarc.webhook.WebhookClient(
-            aggregate_url="http://invalid.test/agg",
-            failure_url="http://invalid.test/fail",
-            smtp_tls_url="http://invalid.test/tls",
-        )
-        with patch.object(
-            client.session, "post", side_effect=Exception("connection refused")
-        ):
-            # Should not raise
-            client._send_to_webhook("http://invalid.test/agg", '{"test": true}')
+    """Tests for webhook client initialization and close"""
 
     def testClose(self):
         """WebhookClient.close() closes session"""