Add Python install cache restore test

.github/workflows/test.yml

@@ -847,6 +847,7 @@ jobs:
         with:
           enable-cache: true
           cache-python: true
+          cache-suffix: ${{ github.run_id }}-${{ github.run_attempt }}-test-cache-python-installs
       - run: uv sync --verbose
         working-directory: __tests__/fixtures/uv-project-pinned-python
       - name: Verify the correct Python version is installed
@@ -864,12 +865,29 @@ jobs:
             echo "Python install dir should exist"
             exit 1
           fi
-      - name: Verify Python is installed in install dir
+  test-restore-python-installs:
+    runs-on: ubuntu-latest
+    needs: test-cache-python-installs
+    steps:
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+        with:
+          persist-credentials: false
+      - name: Restore with cache
+        id: restore
+        uses: ./
+        with:
+          enable-cache: true
+          cache-python: true
+          cache-suffix: ${{ github.run_id }}-${{ github.run_attempt }}-test-cache-python-installs
+      - name: Cache was hit
         run: |
-          if [ ! -f ~/.local/share/uv/python/cpython-3.13.3-linux-x86_64-gnu/bin/python3.13 ]; then
-            echo "Python binary does not exist"
+          if [ "$CACHE_HIT" != "true" ]; then
             exit 1
           fi
+        env:
+          CACHE_HIT: ${{ steps.restore.outputs.cache-hit }}
+      - run: uv sync
+        working-directory: __tests__/fixtures/uv-project-pinned-python
 
   all-tests-passed:
     runs-on: ubuntu-latest
@@ -913,6 +931,8 @@ jobs:
       - test-relative-path
       - test-cache-prune-force
       - test-cache-dir-from-file
+      - test-cache-python-installs
+      - test-restore-python-installs
     if: always()
     steps:
       - name: All tests passed