Merge pull request #1080 from tahoe-lafs/3722.integration-tests-windows-python-3

Enable integration tests on Windows for Python 3

Fixes ticket:3722

.github/workflows/ci.yml

@@ -173,13 +173,15 @@ jobs:
       fail-fast: false
       matrix:
         os:
-          - macos-latest
           - windows-latest
+          - ubuntu-latest
         python-version:
           - 2.7
+          - 3.6
+          - 3.9
         include:
-          - os: ubuntu-latest
-            python-version: 3.6
+          - os: macos-latest
+            python-version: 2.7
 
     steps:
 

tox.ini

@@ -104,7 +104,7 @@ setenv =
 commands =
          python --version
          # NOTE: 'run with "py.test --keep-tempdir -s -v integration/" to debug failures'
-         python3 -b -m pytest --timeout=1800 --coverage -v {posargs:integration}
+         py.test --timeout=1800 --coverage -v {posargs:integration}
          coverage combine
          coverage report