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Sarj Standards

Python · testing

sleep-with-computed-arg-in-test

python:sleep-with-computed-arg-in-test

Computed `sleep()` in a test body — synchronize on the signal, don't guess a delay.

Code
SARJ047
Default
error
Fix
none
Languages
python

Why

A calculated delay still races the system under load and makes test duration depend on guessed timing.

Fix

Await completion, wait on an event, or poll the expected condition with a bounded deadline.

Before / after

Executed by this rule’s unit tests.

Before

Test guesses a computed delay

tests/test_worker.py · focus
import asyncio

async def test_worker():
    await asyncio.sleep(POLL_INTERVAL * 4)
    assert finished()

After

Test waits for completion

tests/test_worker.py · focus
async def test_worker():
    finished = start_worker()
    await finished.wait()
    assert finished.is_set()

Limits

  • Only `time.sleep` and `asyncio.sleep` calls directly inside test functions are analyzed.
  • Numeric literal delays belong to SARJ031; helper-owned and nested-function sleeps are excluded.