Always skip integration tests on Windows (#963)

* Try running integration tests on macOS and Windows

* Allow WindowsPath in run

* Skip erroring tests on Windows

* Revert test matrix

.github/workflows/main.yml

@@ -63,6 +63,7 @@ jobs:
   # it's still helpful to run them on PRs. See:
   # https://github.com/pypa/twine/issues/684#issuecomment-703150619
   integration:
+    # Only run on Ubuntu because most of the tests are skipped on Windows
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3

tests/test_integration.py

@@ -18,20 +18,20 @@
 
 pytestmark = [pytest.mark.enable_socket]
 
-run = functools.partial(subprocess.run, check=True)
-
-xfail_win32 = pytest.mark.xfail(
-    sys.platform == "win32",
-    reason="pytest-services watcher_getter fixture does not support Windows",
+skip_if_windows = pytest.mark.skipif(
+    platform.system() == "Windows",
+    reason="pytest-services fixtures don't support Windows",
 )
 
+run = functools.partial(subprocess.run, check=True)
+
 
 @pytest.fixture(scope="session")
 def sampleproject_dist(tmp_path_factory: pytest.TempPathFactory):
     checkout = tmp_path_factory.mktemp("sampleproject", numbered=False)
     tag = datetime.datetime.now().strftime("%Y%m%d%H%M%S%f")
 
-    run(["git", "clone", "https://github.com/pypa/sampleproject", checkout])
+    run(["git", "clone", "https://github.com/pypa/sampleproject", str(checkout)])
 
     pyproject = checkout / "pyproject.toml"
     pyproject.write_text(
@@ -174,7 +174,7 @@ def devpi_run(cmd):
     return SimpleNamespace(url=repo, username=username, password=password)
 
 
-@xfail_win32
+@skip_if_windows
 def test_devpi_upload(devpi_server, uploadable_dist):
     command = [
         "upload",
@@ -222,7 +222,7 @@ def ready():
     return SimpleNamespace(url=url)
 
 
-@xfail_win32
+@skip_if_windows
 def test_pypiserver_upload(pypiserver_instance, uploadable_dist):
     command = [
         "upload",