Add 3.11-dev to CI (#11677)

Author: sobolevn

.github/workflows/test.yml

@@ -113,24 +113,22 @@ jobs:
     - name: Test
       run: tox -e ${{ matrix.toxenv }} --skip-pkg-install -- ${{ matrix.tox_extra_args }}
 
-# TODO: uncomment this when 3.11-dev is available
-#  python-nightly:
-#    runs-on: ubuntu-latest
-#    name: Test suite with Python nightly
-#    steps:
-#    - uses: actions/checkout@v2
-#    - uses: actions/setup-python@v2
-#      with:
-#        python-version: '3.11-dev'
-#    - name: Install tox
-#      run: |
-#        pip install -U pip==21.2.3 setuptools
-#        pip install --upgrade 'setuptools!=50' virtualenv==20.4.7 tox==3.20.1
-#    - name: Setup tox environment
-#      run: tox -e py --notest
-#    - name: Test
-#      run: tox -e py --skip-pkg-install -- "-n 2"
-#      continue-on-error: true
-#    - name: Mark as a success
-#      run: exit 0
-
+  python-nightly:
+    runs-on: ubuntu-latest
+    name: Test suite with Python nightly
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/setup-python@v2
+      with:
+        python-version: '3.11-dev'
+    - name: Install tox
+      run: |
+        pip install -U pip==21.2.3 setuptools
+        pip install --upgrade 'setuptools!=50' virtualenv==20.4.7 tox==3.20.1
+    - name: Setup tox environment
+      run: tox -e py --notest
+    - name: Test
+      run: tox -e py --skip-pkg-install -- "-n 2"
+      continue-on-error: true
+    - name: Mark as a success
+      run: exit 0

test-requirements.txt

@@ -4,7 +4,7 @@ attrs>=18.0
 flake8==3.9.2
 flake8-bugbear
 flake8-pyi>=20.5
-lxml>=4.4.0
+lxml>=4.4.0; python_version<'3.11'
 psutil>=4.0
 pytest>=6.2.0,<7.0.0
 pytest-xdist>=1.34.0,<2.0.0