Add uv-cache-hit and test CI

.github/workflows/test.yml

@@ -35,6 +35,25 @@ jobs:
         uses: ./
       - run: uv sync
         working-directory: __tests__/fixtures/uv-project
+  test-default-version-cache: # https://github.com/astral-sh/setup-uv/issues/171
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, macos-14]
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install latest version
+        uses: ./
+      - name: Verify cache hit
+        id: re-setup-uv
+        uses: ./
+      - name: Verify uv cache hit
+        run: |
+          if [ "$UV_CACHE_HIT" != "true" ]; then
+            exit 1
+          fi
+        env:
+          UV_CACHE_HIT: ${{ steps.re-setup-uv.outputs.uv-cache-hit }}
   test-specific-version:
     runs-on: ubuntu-latest
     strategy:
@@ -105,13 +124,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os:
-          [
-            ubuntu-latest,
-            macos-latest,
-            macos-14,
-            windows-latest,
-          ]
+        os: [ubuntu-latest, macos-latest, macos-14, windows-latest]
     steps:
       - uses: actions/checkout@v4
       - name: Install default version