test: add comprehensive tests across modules to increase coverage above 60%

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

tests/test_diagnostic.py

@@ -0,0 +1,38 @@
+"""Tests for app/api/diagnostic.py module."""
+import pytest
+
+
+@pytest.mark.integration
+class TestDiagnosticSettings:
+    """Tests for diagnostic settings endpoint."""
+
+    def test_diagnostic_settings_endpoint(self, client):
+        """Test /api/diagnostic/settings endpoint."""
+        response = client.get("/api/diagnostic/settings")
+        assert response.status_code == 200
+        data = response.json()
+        assert data["status"] == "success"
+        assert "settings" in data
+        assert "configured_services" in data["settings"]
+
+    def test_diagnostic_settings_has_expected_services(self, client):
+        """Test that diagnostic settings has expected service keys."""
+        response = client.get("/api/diagnostic/settings")
+        data = response.json()
+        services = data["settings"]["configured_services"]
+        expected_keys = ["email", "s3", "dropbox", "onedrive", "nextcloud", "sftp", "openai", "azure"]
+        for key in expected_keys:
+            assert key in services
+
+
+@pytest.mark.integration
+class TestTestNotification:
+    """Tests for test notification endpoint."""
+
+    def test_test_notification_endpoint(self, client):
+        """Test /api/diagnostic/test-notification endpoint."""
+        response = client.post("/api/diagnostic/test-notification")
+        assert response.status_code == 200
+        data = response.json()
+        # Should return warning (no notification services configured) or success
+        assert data["status"] in ("warning", "success", "error")