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import asyncio
import pytest
from textual.rlock import RLock
async def test_simple_lock():
lock = RLock()
# Starts not locked
assert not lock.is_locked
# Acquire the lock
await lock.acquire()
assert lock.is_locked
# Acquire a second time (should not block)
await lock.acquire()
assert lock.is_locked
# Release the lock
lock.release()
# Should still be locked
assert lock.is_locked
# Release the lock
lock.release()
# Should be released
assert not lock.is_locked
# Another release is a runtime error
with pytest.raises(RuntimeError):
lock.release()
async def test_multiple_tasks() -> None:
"""Check RLock prevents other tasks from acquiring lock."""
lock = RLock()
started: list[int] = []
done: list[int] = []
async def test_task(n: int) -> None:
started.append(n)
async with lock:
done.append(n)
async with lock:
assert done == []
task1 = asyncio.create_task(test_task(1))
assert sorted(started) == []
task2 = asyncio.create_task(test_task(2))
await asyncio.sleep(0)
assert sorted(started) == [1, 2]
await task1
assert 1 in done
await task2
assert 2 in done
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