test: establish monitoring configuration contract

backend/tests/conftest.py

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+"""Shared test configuration for PingWatch backend tests."""

backend/tests/test_settings_validation.py

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+import pytest
+from pydantic import ValidationError
+
+from app.config import Settings
+from app.services.settings_validation import validate_runtime_settings
+
+
+def test_production_rejects_legacy_jwt_secret():
+    settings = Settings(
+        environment="production",
+        secret_key="change-me-to-a-long-random-string",
+    )
+
+    with pytest.raises(ValueError, match="SECRET_KEY"):
+        validate_runtime_settings(settings)
+
+
+def test_probe_packet_count_must_be_positive():
+    with pytest.raises(ValidationError):
+        Settings(probe_packets_per_round=0)
+
+
+def test_production_rejects_tls_disabled_casdoor():
+    settings = Settings(
+        environment="production",
+        secret_key="a-safe-production-secret",
+        casdoor_endpoint="http://casdoor.internal",
+    )
+
+    with pytest.raises(ValueError, match="CASDOOR"):
+        validate_runtime_settings(settings)
+
+
+def test_enabled_wecom_delivery_requires_all_credentials():
+    settings = Settings(wecom_notification_enabled=True, WECOM_CORP_ID="corp")
+
+    with pytest.raises(ValueError, match="WECOM"):
+        validate_runtime_settings(settings)