diff --git a/tests/test_settings.py b/tests/test_settings.py
new file mode 100644
index 0000000..3ff0141
--- /dev/null
+++ b/tests/test_settings.py
@@ -0,0 +1,19 @@
+import pytest
+from pydantic import ValidationError
+
+from app.settings import Settings
+
+
+def test_environment_settings(monkeypatch) -> None:
+    monkeypatch.setenv("MONITOR_REQUEST_TIMEOUT_SECONDS", "3.5")
+    monkeypatch.setenv("MONITOR_MAX_REDIRECTS", "3")
+    settings = Settings()
+    assert settings.request_timeout_seconds == 3.5
+    assert settings.max_redirects == 3
+
+
+def test_invalid_settings_fail_fast() -> None:
+    with pytest.raises(ValidationError):
+        Settings(request_timeout_seconds=0)
+    with pytest.raises(ValidationError):
+        Settings(max_redirects=99)