Build and test python package on Windows CI (#3049)

.github/actions/build-windows/action.yml

@@ -3,7 +3,8 @@ name: 'Build on Windows'
 runs:
   using: 'composite'
   steps:
-    - name: Build CPP only
+    - name: Install Python package
+      id: python-build
       shell: cmd
       env:
         # For MSVC, Ninja/Release is the only config supported by ccache.
@@ -14,5 +15,12 @@ runs:
           -DCMAKE_CXX_COMPILER=cl
           -DCMAKE_RC_COMPILER=rc
       run: |
-        cmake . -B build %CMAKE_ARGS%
+        uv pip install ".[dev]" -v
+        :: Pass the CMAKE_ARGS to following steps.
+        >>%GITHUB_OUTPUT% ECHO CMAKE_ARGS=%CMAKE_ARGS%
+
+    - name: Build CPP only
+      shell: cmd
+      run: |
+        cmake . -B build ${{ steps.python-build.outputs.CMAKE_ARGS }}
         cmake --build build -j %NUMBER_OF_PROCESSORS%

.github/actions/setup-windows/action.yml

@@ -20,10 +20,6 @@ runs:
         key: ccache-${{ runner.os }}-${{ runner.arch }}-cpu
         max-size: 1GB
 
-    - uses: actions/setup-python@v6
-      with:
-        python-version: ${{ inputs.python-version }}
-
     - name: Setup Visual Studio cmd
       shell: cmd
       run: |
@@ -35,3 +31,12 @@ runs:
         call "%VSPATH%\VC\Auxiliary\Build\vcvarsall.bat" x64
         :: Export to all steps.
         >>%GITHUB_ENV% set
+
+    - uses: astral-sh/setup-uv@v7
+
+    - name: Setup Python venv
+      shell: cmd
+      run: |
+        uv venv --python ${{ inputs.python-version }}
+        call ".venv/Scripts/activate.bat"
+        >>%GITHUB_ENV% set

.github/actions/test-windows/action.yml

@@ -3,6 +3,13 @@ name: 'Run tests on Windows'
 runs:
   using: 'composite'
   steps:
+    - name: Run Python tests - CPU
+      shell: bash
+      run: |
+        echo "::group::Python tests - CPU"
+        python -m unittest discover python/tests -v
+        echo "::endgroup::"
+
     - name: Run CPP tests - CPU
       shell: bash
       env:

.github/workflows/build_and_test.yml

@@ -83,8 +83,6 @@ jobs:
     steps:
       - uses: actions/checkout@v6
       - uses: ./.github/actions/setup-windows
-        with:
-          use-ccache: false
       - uses: ./.github/actions/build-windows
       - uses: ./.github/actions/test-windows