Add passing 3.11 CI by exempting blackd tests (#3234)

- Had to exempt blackd tests for now due to aiohttp
  - Skip by using `sys.version_info` tuple
  - aiohttp does not compile in 3.11 yet - refer to #3230
- Add a deadsnakes ubuntu workflow to run 3.11-dev to ensure we don't regress
  - Have it also format ourselves

Test:
- `tox -e 311`

Co-authored-by: Cooper Ry Lees <me@wcooperlees.com>
Co-authored-by: Richard Si <63936253+ichard26@users.noreply.github.com>

.github/workflows/test-311.yml

@@ -0,0 +1,57 @@
+name: Partially test 3.11 dev
+
+on:
+  push:
+    paths-ignore:
+      - "docs/**"
+      - "*.md"
+
+  pull_request:
+    paths-ignore:
+      - "docs/**"
+      - "*.md"
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  main:
+    # We want to run on external PRs, but not on our own internal PRs as they'll be run
+    # by the push to the branch. Without this if check, checks are duplicated since
+    # internal PRs match both the push and pull_request events.
+    if:
+      github.event_name == 'push' || github.event.pull_request.head.repo.full_name !=
+      github.repository
+
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.11.0-rc - 3.11"]
+        os: [ubuntu-latest, macOS-latest, windows-latest]
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install tox
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install --upgrade tox
+
+      - name: Run tests via tox
+        run: |
+          python -m tox -e 311
+
+      - name: Format ourselves
+        run: |
+          python -m pip install .
+          python -m black --check src/

CHANGES.md

@@ -69,6 +69,8 @@
 
 <!-- Changes to how Black is packaged, such as dependency requirements -->
 
+- Python 3.11 is now supported, except for `blackd` (#3234)
+
 ### Parser
 
 <!-- Changes to the parser or to version autodetection -->

setup.py

@@ -127,6 +127,7 @@ def find_python_files(base: Path) -> List[Path]:
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
+        "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3 :: Only",
         "Topic :: Software Development :: Libraries :: Python Modules",
         "Topic :: Software Development :: Quality Assurance",

tests/test_blackd.py

@@ -1,4 +1,5 @@
 import re
+import sys
 from typing import Any
 from unittest.mock import patch
 
@@ -7,6 +8,9 @@
 
 from tests.util import DETERMINISTIC_HEADER, read_data
 
+LESS_THAN_311 = sys.version_info < (3, 11)
+
+if LESS_THAN_311:  # noqa: C901
     try:
         from aiohttp import web
         from aiohttp.test_utils import AioHTTPTestCase
@@ -23,7 +27,6 @@
         def unittest_run_loop(func: Any, *args: Any, **kwargs: Any) -> Any:
             return func
 
-
     @pytest.mark.blackd
     class BlackDTestCase(AioHTTPTestCase):
         def test_blackd_main(self) -> None:
@@ -77,7 +80,9 @@ async def test_blackd_supported_version(self) -> None:
         async def test_blackd_invalid_python_variant(self) -> None:
             async def check(header_value: str, expected_status: int = 400) -> None:
                 response = await self.client.post(
-                "/", data=b"what", headers={blackd.PYTHON_VARIANT_HEADER: header_value}
+                    "/",
+                    data=b"what",
+                    headers={blackd.PYTHON_VARIANT_HEADER: header_value},
                 )
                 self.assertEqual(response.status, expected_status)
 
@@ -163,7 +168,9 @@ async def test_blackd_line_length(self) -> None:
         @unittest_run_loop
         async def test_blackd_invalid_line_length(self) -> None:
             response = await self.client.post(
-            "/", data=b'print("hello")\n', headers={blackd.LINE_LENGTH_HEADER: "NaN"}
+                "/",
+                data=b'print("hello")\n',
+                headers={blackd.LINE_LENGTH_HEADER: "NaN"},
             )
             self.assertEqual(response.status, 400)
 

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = {,ci-}py{36,37,38,39,310,py3},fuzz,run_self
+envlist = {,ci-}py{36,37,38,39,310,311,py3},fuzz,run_self
 
 [testenv]
 setenv = PYTHONPATH = {toxinidir}/src
@@ -50,6 +50,31 @@ commands =
         --cov --cov-append {posargs}
     coverage report
 
+[testenv:{,ci-}311]
+setenv = PYTHONPATH = {toxinidir}/src
+skip_install = True
+recreate = True
+deps =
+    -r{toxinidir}/test_requirements.txt
+; a separate worker is required in ci due to https://foss.heptapod.net/pypy/pypy/-/issues/3317
+; this seems to cause tox to wait forever
+; remove this when pypy releases the bugfix
+commands =
+    pip install -e .
+    coverage erase
+    pytest tests \
+        --run-optional no_jupyter \
+        !ci: --numprocesses auto \
+        ci: --numprocesses 1 \
+        --cov {posargs}
+    pip install -e .[jupyter]
+    pytest tests --run-optional jupyter \
+        -m jupyter \
+        !ci: --numprocesses auto \
+        ci: --numprocesses 1 \
+        --cov --cov-append {posargs}
+    coverage report
+
 [testenv:fuzz]
 skip_install = True
 deps =