diff --git a/tests/test_config.py b/tests/test_config.py
index 84c12c1..ea20d23 100644
--- a/tests/test_config.py
+++ b/tests/test_config.py
@@ -4,15 +4,10 @@ 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")
+def test_environment_prefix_and_validation(monkeypatch):
+    monkeypatch.setenv("MONITOR_CHECK_TIMEOUT_SECONDS", "2.5")
+    assert Settings().check_timeout_seconds == 2.5
     with pytest.raises(ValidationError):
-        Settings()
+        Settings(check_timeout_seconds=0)
+    with pytest.raises(ValidationError):
+        Settings(max_redirects=99)