Changed idle helper duration in tests.
New runtime:
```
real    0m16.265s
user    0m12.503s
sys     0m0.177s
```
@@ -37,7 +37,7 @@ import pytest
# good way to advance the state of an asyncio coroutine without manually
# iterating it, which I consider to be far more evil and will vary in results
# if unrelated changes are made in the same function.
-REASONABLE_SLEEP_TIME = 0.5
+REASONABLE_SLEEP_TIME = 0.05
# How long to reasonably expect something to take if it is considered instant.
REASONABLE_QUICK_RESPONSE_TIME = 0.05
