Release 8.4.0

It is no longer.

(cherry picked from commit 80dfa2d)

Co-authored-by: Ran Benita <[email protected]>

Fixes #13461.

(cherry picked from commit cba5c4a)

Co-authored-by: Martin Fischer <[email protected]>

Fix typo in docs regarding capsys/capteesys

(cherry picked from commit 8f93ae9)

Co-authored-by: John Litborn <[email protected]>

#13493)

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(cherry picked from commit 216c7ec)

Co-authored-by: Iwithyou2025 <[email protected]>
Co-authored-by: Bruno Oliveira <[email protected]>

(cherry picked from commit 64c1173)

Co-authored-by: SarahPythonista <[email protected]>

…ed up test suite (#13525) (#13526)

Because `pytester.runpytest()` executes the full session cycle (including
`pytest_unconfigure`), it was calling `gc.collect()` in a loop multiple
times—even for small, fast tests. This significantly increased the total
test suite runtime.

To optimize performance, disable the gc runs in inline pytester runs
entirely, matching the behavior before #12958.

Locally the test suite runtime improved dramatically, dropping from 425s
to 160s.

Fixes #13482.


(cherry picked from commit 391324e)

Co-authored-by: Ran Benita <[email protected]>
Co-authored-by: Bruno Oliveira <[email protected]>

As discussed in #13502, the fix for compatibility with Twisted 25+ is simpler. Therefore, it makes sense to implement both fixes (for Twisted 24 and Twisted 25) in parallel. This way, we can eventually drop support for Twisted <25 and keep only the simpler workaround.

In addition, the `unittestextras` tox environment has been replaced with dedicated test environments for `asynctest`, `Twisted 24`, and `Twisted 25`.

Fixes #13497

(cherry picked from commit 01dce85)

Co-authored-by: Bruno Oliveira <[email protected]>

Since this warning is meant to be permanent, added proper documentation to the `assert` section in the docs.

Fixes #13477

(cherry picked from commit 53f05c4)

Co-authored-by: Bruno Oliveira <[email protected]>

…13529) (#13532)

(cherry picked from commit 40a1713)

Co-authored-by: Iwithyou2025 <[email protected]>