CI Simplify Windows cibuildwheel setup

.github/workflows/wheels.yml

@@ -174,8 +174,6 @@ jobs:
         uses: pypa/cibuildwheel@f03ac7617d6cff873ccf24cc0d567ef5ba5a9e6d # v4.0.0
         env:
           CIBW_BUILD: cp${{ matrix.python }}-${{ matrix.platform_id }}
-          CIBW_BEFORE_TEST_WINDOWS: bash tools/build_minimal_windows_image.sh ${{ matrix.python }} ${{ matrix.platform_id }}
-          CIBW_TEST_COMMAND_WINDOWS: bash {project}/tools/test_windows_wheels.sh ${{ matrix.python }} {project} ${{ matrix.platform_id }}
           SOURCE_DATE_EPOCH: ${{ env.SOURCE_DATE_EPOCH }}
           PYTHONHASHSEED: "0"
           CIBW_ENVIRONMENT_PASS_LINUX: SOURCE_DATE_EPOCH PYTHONHASHSEED RUNNER_OS
@@ -184,6 +182,15 @@ jobs:
            output-dir: dist
            config-file: cibuildwheel.toml
 
+      # Running in a minimal Docker image makes sure that we bundled correctly
+      # the shared libraries for MSVC C++ runtime and OpenMP in the Windows
+      # wheel
+      - name: Test Windows wheel in a minimal Docker image
+        # Currently Windows ARM64 runners do not have Docker support and there
+        # is no Docker image with free-threaded
+        if: ${{ matrix.platform_id == 'win_amd64' && !contains(matrix.python, 't') }}
+        run: bash tools/test_windows_wheels_in_docker.sh ${{ matrix.python }}
+
       - name: Store artifacts
         uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
         with:

cibuildwheel.toml

@@ -15,7 +15,3 @@ test-command = "bash {project}/tools/test_wheels.sh {project}"
 # toolchain
 config-settings = "setup-args=--vsenv"
 repair-wheel-command = "bash tools/repair_windows_wheels.sh {wheel} {dest_dir}"
-# On Windows, we use a custom Docker image and the test dependencies are
-# installed inside the Docker image rather than on the host, so there are no
-# test requirements to install here.
-test-requires = []

tools/test_windows_wheels_in_docker.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+
+set -e
+set -x
+
+PYTHON_VERSION=$1
+
+WHEEL_PATH=$(ls dist/*.whl)
+
+# Dot the Python version for identifying the base Docker image.
+PYTHON_DOCKER_IMAGE_PART="${PYTHON_VERSION:0:1}.${PYTHON_VERSION:1:2}"
+
+DOCKER_IMAGE="winamd64/python:${PYTHON_DOCKER_IMAGE_PART}-windowsservercore"
+MNT_FOLDER="C:/mnt"
+CONTAINER_ID=$(docker run -it -v "$(cygpath -w "$PWD"):$MNT_FOLDER" -d "$DOCKER_IMAGE")
+
+function exec_inside_container() {
+    docker exec "$CONTAINER_ID" powershell -Command "$1"
+}
+
+exec_inside_container "python -m venv C:/venv"
+exec_inside_container "C:/venv/Scripts/python -m pip install $MNT_FOLDER/$WHEEL_PATH"
+exec_inside_container "C:/venv/Scripts/python -c 'import sklearn; sklearn.show_versions()'"
+# Running the estimator checks is a good enough check to make sure we bundled
+# correctly the shared libraries on Windows, while still being reasonably fast
+# to run.
+exec_inside_container "C:/venv/Scripts/python -m sklearn.utils.tests.test_estimator_checks"