存档求解器回归基线与当前改动

纳管 AMESim 对齐基线、发布锁、回归测试及当前物理门禁调整。

更新日志仅记录已完成成果，并注明当前 HEAD 尚待真实 production 复跑与远端 workflow 验证。

tests/test_test_mql_comparison.py

@@ -1,10 +1,14 @@
 from __future__ import annotations
 
+import csv
 import tempfile
 import unittest
 from pathlib import Path
 
-from app.simulation.reporting.amesim_results import load_test_mql_amesim_results
+from app.simulation.reporting.amesim_results import (
+    AmesimResults,
+    load_test_mql_amesim_results,
+)
 from app.simulation.reporting.test_mql_comparison import (
     DEFAULT_TEST_MQL_ALIGNMENT_PATHS,
     TestMqlComparisonError,
@@ -84,6 +88,46 @@ class TestMqlComparisonTests(unittest.TestCase):
         self.assertAlmostEqual(metric.mean_abs_error, 1.0)
         self.assertGreater(metric.max_rel_error, 0.0)
 
+    def test_zero_amesim_baseline_does_not_invent_a_relative_denominator(self) -> None:
+        amesim_results = AmesimResults(
+            times=(0.0, 1.0),
+            variables=(),
+            saved_variable_indices=(),
+            series_by_data_path={"zero@baseline": (0.0, -0.0)},
+            final_values_by_data_path={"zero@baseline": -0.0},
+        )
+
+        comparison = compare_test_mql_series(
+            python_times=(0.0, 1.0),
+            python_series_by_data_path={"zero@baseline": (0.0, 1.0e-6)},
+            amesim_results=amesim_results,
+            data_paths=("zero@baseline",),
+        )
+        metric = comparison.metric("zero@baseline")
+
+        self.assertEqual(metric.max_abs_error, 1.0e-6)
+        self.assertEqual(metric.undefined_rel_error_count, 2)
+        self.assertEqual(metric.near_zero_baseline_count, 2)
+        self.assertEqual(comparison.undefined_rel_error_count, 2)
+        self.assertEqual(metric.max_rel_error, 0.0)
+
+        with tempfile.TemporaryDirectory() as temp_dir:
+            comparison_path, _summary_path, _comparison = (
+                write_test_mql_comparison_csv(
+                    output_dir=Path(temp_dir),
+                    python_times=(0.0, 1.0),
+                    python_series_by_data_path={
+                        "zero@baseline": (0.0, 1.0e-6)
+                    },
+                    amesim_results=amesim_results,
+                    data_paths=("zero@baseline",),
+                )
+            )
+            with comparison_path.open(newline="", encoding="utf-8") as handle:
+                rows = list(csv.reader(handle))
+            self.assertEqual(rows[1][-1], "")
+            self.assertEqual(rows[2][-1], "")
+
     def test_missing_data_path_is_rejected(self) -> None:
         with self.assertRaises(TestMqlComparisonError):
             compare_test_mql_series(