add unit tests

.github/workflows/versions.yml

@@ -71,6 +71,26 @@ jobs:
           __tests__/verify-node.sh "$majorVersion"
         shell: bash
 
+  rc-syntax:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+        node-version: [16.0.0-rc.1, 18.0.0-rc.2, 19.0.0-rc.0]
+    steps:
+      - uses: actions/checkout@v3
+      - name: Setup Node
+        uses: ./
+        with:
+          node-version: ${{ matrix.node-version }}
+      - name: Verify node and npm
+        run: |
+          rcVersion="${{ matrix.node-version }}"
+          majorVersion=$(echo $rcVersion | cut -d- -f1)
+          __tests__/verify-node.sh "$majorVersion"
+        shell: bash
+
   manifest:
     runs-on: ${{ matrix.os }}
     strategy: