Initial Windows CI setup w/o caching.

.github/workflows/ci.yml

@@ -216,12 +216,54 @@ jobs:
         with:
           path: ${{ env._PEX_TEST_DEV_ROOT }}/devpi
           key: ${{ steps.restore-devpi-server.outputs.cache-primary-key }}
+  windows-tests:
+    name: tox -e ${{ matrix.tox-env }} ${{ matrix.pex-test-pos-args }}
+    needs: org-check
+    runs-on: windows-2022
+    strategy:
+      matrix:
+        include:
+          - python-version: [ 3, 13 ]
+            tox-env: format-check,lint-check,typecheck,package,docs
+          - python-version: [ 3, 13 ]
+            tox-env: py313-pip25_0
+          - python-version: [ 3, 13 ]
+            tox-env: py313-pip25_0-integration
+            pex-test-pos-args: --shard 1/2
+          - python-version: [ 3, 13 ]
+            tox-env: py313-pip25_0-integration
+            pex-test-pos-args: --shard 2/2
+    steps:
+      - name: Checkout Pex
+        uses: actions/checkout@v4
+        with:
+          # We need branches and tags for some ITs.
+          fetch-depth: 0
+          path: repo
+      - name: Setup Python ${{ join(matrix.python-version, '.') }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: "${{ join(matrix.python-version, '.') }}"
+      # Some ITs need this for VCS URLs of the form git+ssh://[email protected]/...
+      - name: Setup SSH Agent
+        uses: webfactory/[email protected]
+        env:
+          SSH_PRIVATE_KEY: ${{ secrets.SSH_PRIVATE_KEY }}
+        if: env.SSH_PRIVATE_KEY != ''
+        with:
+          ssh-private-key: ${{ env.SSH_PRIVATE_KEY }}
+      - name: Run Tests
+        continue-on-error: true
+        run:
+          python -mpip install tox
+          tox ${{ matrix.tox-env }} -- ${{ env._PEX_TEST_POS_ARGS }} ${{ matrix.pex-test-pos-args }}
   final-status:
     name: Gather Final Status
     needs:
       - checks
       - linux-tests
       - mac-tests
+      - windows-tests
     runs-on: ubuntu-24.04
     steps:
       - name: Check Non-Success

tests/integration/test_shebang_length_limit.py

@@ -18,6 +18,7 @@
 from pex.common import safe_open, touch
 from pex.executables import chmod_plus_x
 from pex.fs import safe_symlink
+from pex.os import WINDOWS
 from pex.typing import TYPE_CHECKING
 from testing import IS_PYPY, make_project, run_pex_command
 from testing.cli import run_pex3
@@ -51,7 +52,10 @@ def find_max_length(
 
 # Pytest fails to cleanup tmp dirs used probing file_path_length_limit and this squashes a very
 # large ream of warnings.
-pytestmark = pytest.mark.filterwarnings("ignore:\\(rm_rf\\) error removing.*:pytest.PytestWarning")
+if WINDOWS:
+    pytestmark = pytest.mark.skip("The current process of probing limits can break Windows.")
+else:
+    pytestmark = pytest.mark.filterwarnings("ignore:\\(rm_rf\\) error removing.*:pytest.PytestWarning")
 
 
 @pytest.fixture(scope="session")