diff --git a/discord_rss_bot/healthcheck.py b/discord_rss_bot/healthcheck.py
index 5c35a1e..7fa0231 100644
--- a/discord_rss_bot/healthcheck.py
+++ b/discord_rss_bot/healthcheck.py
@@ -16,6 +16,7 @@ def healthcheck() -> None:
         r: requests.Response = requests.get(url="http://localhost:5000", timeout=5)
         if r.ok:
             sys.exit(0)
+        sys.exit(1)
     except requests.exceptions.RequestException as e:
         print(f"Healthcheck failed: {e}", file=sys.stderr)  # noqa: T201
         sys.exit(1)
diff --git a/tests/test_healthcheck.py b/tests/test_healthcheck.py
new file mode 100644
index 0000000..70977df
--- /dev/null
+++ b/tests/test_healthcheck.py
@@ -0,0 +1,69 @@
+from __future__ import annotations
+
+from unittest.mock import MagicMock
+from unittest.mock import patch
+
+import pytest
+import requests
+
+from discord_rss_bot.healthcheck import healthcheck
+
+
+def test_healthcheck_success() -> None:
+    """Test that healthcheck exits with 0 when the website is up."""
+    mock_response = MagicMock()
+    mock_response.ok = True
+
+    with (
+        patch("discord_rss_bot.healthcheck.requests.get", return_value=mock_response),
+        pytest.raises(SystemExit) as exc_info,
+    ):
+        healthcheck()
+
+    assert exc_info.value.code == 0
+
+
+def test_healthcheck_not_ok() -> None:
+    """Test that healthcheck exits with 1 when the response is not ok."""
+    mock_response = MagicMock()
+    mock_response.ok = False
+
+    with (
+        patch("discord_rss_bot.healthcheck.requests.get", return_value=mock_response),
+        pytest.raises(SystemExit) as exc_info,
+    ):
+        healthcheck()
+
+    assert exc_info.value.code == 1
+
+
+def test_healthcheck_request_exception(capsys: pytest.CaptureFixture) -> None:
+    """Test that healthcheck exits with 1 on a request exception."""
+    with (
+        patch(
+            "discord_rss_bot.healthcheck.requests.get",
+            side_effect=requests.exceptions.ConnectionError("Connection refused"),
+        ),
+        pytest.raises(SystemExit) as exc_info,
+    ):
+        healthcheck()
+
+    assert exc_info.value.code == 1
+    captured = capsys.readouterr()
+    assert "Healthcheck failed" in captured.err
+
+
+def test_healthcheck_timeout(capsys: pytest.CaptureFixture) -> None:
+    """Test that healthcheck exits with 1 on a timeout."""
+    with (
+        patch(
+            "discord_rss_bot.healthcheck.requests.get",
+            side_effect=requests.exceptions.Timeout("Request timed out"),
+        ),
+        pytest.raises(SystemExit) as exc_info,
+    ):
+        healthcheck()
+
+    assert exc_info.value.code == 1
+    captured = capsys.readouterr()
+    assert "Healthcheck failed" in captured.err