diff --git a/tests/test_logging.py b/tests/test_logging.py
index 0360a57..672dedc 100644
--- a/tests/test_logging.py
+++ b/tests/test_logging.py
@@ -1,19 +1,26 @@
-import json
 import logging
 
-from app.logging_config import JsonFormatter, redact_url
+import httpx
+import pytest
+
+from app.checker import EndpointChecker
+from app.config import Settings
 
 
-def test_redact_url_removes_credentials_query_and_fragment():
-    assert redact_url("https://user:pass@example.com:8443/a?token=secret#x") == "https://example.com:8443/a"
+async def public_resolver(host: str, port: int) -> list[str]:
+    return ["93.184.216.34"]
 
 
-def test_json_formatter_never_emits_url_secrets():
-    record = logging.LogRecord("test", logging.INFO, "", 0, "event", (), None)
-    record.url = "https://user:pass@example.com/a?token=secret#fragment"
-    record.monitor_id = "123"
-    output = JsonFormatter().format(record)
-    parsed = json.loads(output)
-    assert parsed["url"] == "https://example.com/a"
-    assert "secret" not in output
-    assert "pass" not in output
+@pytest.mark.anyio
+async def test_logs_redact_credentials_query_and_fragment(caplog: pytest.LogCaptureFixture) -> None:
+    checker = EndpointChecker(
+        Settings(),
+        transport=httpx.MockTransport(lambda request: httpx.Response(200)),
+        resolver=public_resolver,
+    )
+    with caplog.at_level(logging.INFO, logger="endpoint_monitor.checker"):
+        await checker.check("monitor-1", "https://example.com/path?token=topsecret#fragment")
+    record = next(record for record in caplog.records if getattr(record, "event", None) == "check_completed")
+    assert record.url == "https://example.com/path"
+    assert "topsecret" not in record.getMessage()
+    assert "topsecret" not in record.url