diff --git a/tests/test_config.py b/tests/test_config.py
new file mode 100644
index 0000000..84c12c1
--- /dev/null
+++ b/tests/test_config.py
@@ -0,0 +1,18 @@
+import pytest
+from pydantic import ValidationError
+
+from app.config import Settings
+
+
+def test_environment_settings(monkeypatch):
+    monkeypatch.setenv("MONITOR_REQUEST_TIMEOUT_SECONDS", "2.5")
+    monkeypatch.setenv("MONITOR_MAX_REDIRECTS", "3")
+    settings = Settings()
+    assert settings.request_timeout_seconds == 2.5
+    assert settings.max_redirects == 3
+
+
+def test_invalid_environment_is_rejected(monkeypatch):
+    monkeypatch.setenv("MONITOR_MAX_REDIRECTS", "99")
+    with pytest.raises(ValidationError):
+        Settings()