Feature or enhancement

Proposal:

test_io is currently over 5000 lines long and tests a range of behaviors of lots of distinct io components. Some work to make it more modular has happened over time and there are a number of tests for specific subsets of io behavior (see: https://github.com/python/cpython/blob/main/Lib/test/test_io.py#L3-L13), including one for Buffered I/O (test_bufio.py, 74 lines currently)

About 1200 lines of test_io are Buffered I/O specific tests which are well isolated / can be moved relatively easily (BufferedReaderTest, BufferedWriterTest, BufferedRWPairTest, and BufferedRandomTest as well as their Py*/C* variants). I'd like to move them from test_io to test_bufio to make it simpler/faster to iterate / test / validate Buffered I/O behavior.

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

No response