fix ci

Author: ota-meshi

.github/workflows/CI.yml

@@ -40,10 +40,6 @@ jobs:
           - eslint: 9
             node: 'lts/*'
             os: macos-latest
-          # On old ESLint versions
-          - eslint: 8
-            node: 'lts/*'
-            os: ubuntu-latest
 
     runs-on: ${{ matrix.os }}
     steps:
@@ -63,6 +59,30 @@ jobs:
       run: npm run -s build
     - name: Test
       run: npm run -s test:mocha
+  test-for-old-eslint:
+    name: Test
+    strategy:
+      matrix:
+        eslint: [8]
+        node: ['lts/*']
+        os: [ubuntu-latest]
+
+    runs-on: ${{ matrix.os }}
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+    - name: Checkout submodules
+      run: git submodule update --init
+    - name: Install Node.js v${{ matrix.node }}
+      uses: actions/setup-node@v4
+      with:
+        node-version: ${{ matrix.node }}
+    - name: Install Packages
+      run: npm install -f
+    - name: Install ESLint v${{ matrix.eslint }}
+      run: node scripts/ci-install-eslint ${{ matrix.eslint }}
+    - name: Test
+      run: npm run -s test:debug
 
   test-cov:
     name: Test and Send Coverage