"""工位 Qt 运行时回归：无设备、无 ROS，检测导致一分钟崩溃的引用计数错误。

运行：bash station/run_station.sh --self-test
"""
import sys
import unittest

import PySide6
from PySide6.QtWidgets import QApplication, QLabel


class QtRuntimeTest(unittest.TestCase):
    def test_void_calls_preserve_none(self):
        # 先检查版本，防止在有缺陷的绑定上运行压力循环导致解释器直接 abort。
        self.assertEqual(PySide6.__version__, "6.8.3")
        app = QApplication.instance() or QApplication([])
        label = QLabel("warmup")

        def refresh():
            label.setText("updated")
            label.update()
            label.setVisible(False)
            label.style().unpolish(label)
            label.style().polish(label)

        for _ in range(20):
            refresh()
        app.processEvents()
        before = sys.getrefcount(None)
        for _ in range(4000):
            refresh()
        after = sys.getrefcount(None)
        self.assertGreater(after - before, -50, "Qt 调用持续递减 None 引用计数")
        label.deleteLater()
        app.processEvents()


if __name__ == "__main__":
    unittest.main()