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tests/test_training_ui_js.py

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+"""训练前端 JS 逻辑回归：用 DOM 桩跑发布的 charts.js/app.js 原文。
+
+动机：该前端的多数 bug 只在浏览器逻辑里暴露（游标重复追加、classList 取错、
+字段缺失导致渲染中断），Python 侧测试无法覆盖。这里用服务端真实生成的
+schema 与示例快照驱动一次完整渲染，有 node 则执行，无 node 自动跳过。
+"""
+
+from __future__ import annotations
+
+import json
+import os
+import shutil
+import subprocess
+import sys
+from pathlib import Path
+
+import pytest
+
+REPO = Path(__file__).resolve().parents[1]
+HARNESS = REPO / "tests" / "js" / "training_ui_harness.cjs"
+
+
+@pytest.mark.skipif(shutil.which("node") is None, reason="需要 node 环境运行 JS 桩测试")
+def test_training_ui_frontend_logic(tmp_path):
+    sys.path.insert(0, str(REPO / "src"))
+    from mcm26b.training_ui.demo import DEMO_SCENARIOS, demo_snapshot
+    from mcm26b.training_ui.schema import config_schema
+
+    scenarios = {key: demo_snapshot(scenario=key) for key in DEMO_SCENARIOS}
+    scenarios_path = tmp_path / "scenarios.json"
+    schema_path = tmp_path / "schema.json"
+    scenarios_path.write_text(json.dumps(scenarios, ensure_ascii=False),
+                              encoding="utf-8")
+    schema_path.write_text(json.dumps(config_schema(), ensure_ascii=False),
+                           encoding="utf-8")
+
+    result = subprocess.run(
+        ["node", str(HARNESS)], capture_output=True, text=True, timeout=120,
+        env={**os.environ, "REPO": str(REPO),
+             "DEMO_STATE": str(scenarios_path), "SCHEMA": str(schema_path)})
+    assert result.returncode == 0, \
+        f"训练前端逻辑测试失败:\n{result.stdout}\n{result.stderr}"
+    assert "ALL PASS" in result.stdout