Report test results in the AppVeyor UI

appveyor.yml

@@ -41,9 +41,14 @@ test_script:
   - python -m pip install --disable-pip-version-check --upgrade pip setuptools wheel
   - pip install --upgrade tox tox-venv virtualenv
   - pip freeze --all
-  - tox
+  - tox -- --junit-xml=test-results.xml
 
 after_test:
     - tox -e coverage,codecov
 
+on_finish:
+  - ps: |
+      $wc = New-Object 'System.Net.WebClient'
+      $wc.UploadFile("https://ci.appveyor.com/api/testresults/junit/$($env:APPVEYOR_JOB_ID)", (Resolve-Path .\test-results.xml))
+
 version: '{build}'