Attempt to re-enable Windows tests

According to a comment in pypa/distutils#118 this problem might be
solved by allowing tox to pass some environment variables.

Author: abravalheri

.github/workflows/main.yml

@@ -24,8 +24,7 @@ jobs:
         platform:
         - ubuntu-latest
         - macos-latest
-        # disable tests on Windows due to pypa/distutils#118
-        # - windows-latest
+        - windows-latest
         include:
         - platform: ubuntu-latest
           python: "3.10"

tox.ini

@@ -20,13 +20,17 @@ passenv =
 	windir  # required for test_pkg_resources
 	# honor git config in pytest-perf
 	HOME
+	PROGRAMFILES
+	PROGRAMFILES(x86)
 
 [testenv:integration]
 deps = {[testenv]deps}
 extras = testing-integration
 passenv =
 	{[testenv]passenv}
 	DOWNLOAD_PATH
+	PROGRAMFILES
+	PROGRAMFILES(x86)
 setenv =
     PROJECT_ROOT = {toxinidir}
 commands =