NexusOS/management/test_controlpanel_close.py

"""Guard against the crash-on-close regression.

The panel's worker/monitor threads schedule Tk callbacks via _safe_after. During
shutdown that .after() raises (thread + dying interpreter); if it escaped, the
worker's `finally` aborted before unlinking its PID file -> stale runtime/pids/*.
These asserts pin the two invariants that prevent that. Run: python test_controlpanel_close.py
"""
from types import SimpleNamespace
from controlpanel import NexusControlPanel


def _fake(closing, after_raises):
    def after(_delay, _fn):
        if after_raises:
            raise RuntimeError("main thread is not in main loop")
    return SimpleNamespace(_closing=closing, root=SimpleNamespace(after=after))


# 1. A raising .after() (teardown condition) must NOT propagate.
NexusControlPanel._safe_after(_fake(closing=False, after_raises=True), 0, lambda: None)

# 2. Once closing, we must not touch Tk at all — schedule is skipped.
scheduled = []
obj = SimpleNamespace(_closing=True, root=SimpleNamespace(after=lambda d, f: scheduled.append(f)))
NexusControlPanel._safe_after(obj, 0, lambda: None)
assert scheduled == [], "closing panel must not schedule Tk callbacks"

print("ok")