Fixes#6881.
`timeout_decorator()` used a `ThreadPoolExecutor` context manager around blocking output waits. When `future.result(timeout=...)` timed out, leaving the context manager still waited for the worker thread to finish, so a blocked stdout read could keep the instrumented tests hanging past the configured timeout.
This change removes that executor wrapper for interactive Stockfish output waits. The harness now drains process output on a daemon reader thread, queues received lines, and applies the deadline directly while waiting for the next queued line. `TimeoutException` also initializes the base exception message so failures show useful text.
Validation:
- `python3 -m py_compile tests/testing.py tests/instrumented.py`
- local timeout smoke test: a 0.2s no-output wait raises in ~0.204s
- Stockfish smoke test: startup/`uciok` read succeeds, deliberate no-output wait raises in ~0.205s, engine exits 0
- `make -C src -j4 build`
- `../tests/signature.sh` -> `2814421`
closes https://github.com/official-stockfish/Stockfish/pull/6882
No functional change
Since an unknown amount of time the instrumented CI has been a bit
flawed, explained here
https://github.com/official-stockfish/Stockfish/issues/5185. It also
experiences random timeout issues where restarting the workflow fixes it
or very long run times (more than other workflows) and is not very
portable.
The intention of this commit is to port the instrumented.sh to python
which also works on other operating systems. It should also be
relatively easy for beginners to add new tests to assert stockfish's
output and to run it.
From the source directory the following command can be run.
`python3 ../tests/instrumented.py --none ./stockfish`
A test runner will go over the test suites and run the test cases.
All instrumented tests should have been ported over.
The required python version for this is should be 3.7 (untested) + the
requests package, testing.py includes some infrastructure code which
setups the testing.
fixes https://github.com/official-stockfish/Stockfish/issues/5185
closes https://github.com/official-stockfish/Stockfish/pull/5583
No functional change
