Enhance testing framework and UI feedback

- Updated architecture documentation to include details on UI rendering checks and Playwright end-to-end tests.
- Revised testing documentation to specify Playwright for frontend E2E tests and added details on running tests.
- Implemented feedback mechanism in scenario form for successful creation notifications.
- Added feedback div in ScenarioForm.html for user notifications.
- Created new fixtures for Playwright tests to manage server and browser instances.
- Developed comprehensive E2E tests for consumption, costs, equipment, maintenance, production, and scenarios.
- Added smoke tests to verify UI page loading and form submissions.
- Enhanced unit tests for simulation and validation, including new tests for report generation and validation errors.
- Created new test files for router validation to ensure consistent error handling.
- Established a new test suite for UI routes to validate dashboard and reporting functionalities.
- Implemented validation tests to ensure proper handling of JSON payloads.

tests/unit/test_reporting.py

@@ -49,6 +49,32 @@ def test_generate_report_with_values():
     assert math.isclose(float(report["expected_shortfall_95"]), 10.0)
 
 
+def test_generate_report_single_value():
+    report = generate_report([
+        {"iteration": 1, "result": 42.0},
+    ])
+    assert report["count"] == 1
+    assert report["std_dev"] == 0.0
+    assert report["variance"] == 0.0
+    assert report["percentile_10"] == 42.0
+    assert report["expected_shortfall_95"] == 42.0
+
+
+def test_generate_report_ignores_invalid_entries():
+    raw_values: List[Any] = [
+        {"iteration": 1, "result": 10.0},
+        "not-a-mapping",
+        {"iteration": 2},
+        {"iteration": 3, "result": None},
+        {"iteration": 4, "result": 20},
+    ]
+    report = generate_report(raw_values)
+    assert report["count"] == 2
+    assert math.isclose(float(report["mean"]), 15.0)
+    assert math.isclose(float(report["min"]), 10.0)
+    assert math.isclose(float(report["max"]), 20.0)
+
+
 @pytest.fixture
 def client(api_client: TestClient) -> TestClient:
     return api_client