test(e2e): verify local tgz packages are installed after migration

Add verify-install.ts that checks vite, vitest, and vite-plus are all
installed at version 0.0.0 (the local tgz version). This catches
override failures early before running project commands.

Author: fengmk2

.github/workflows/e2e-test.yml

@@ -321,6 +321,11 @@ jobs:
           node $GITHUB_WORKSPACE/ecosystem-ci/patch-project.ts ${{ matrix.project.name }}
           vp install --no-frozen-lockfile
 
+      - name: Verify local tgz packages installed
+        working-directory: ${{ runner.temp }}/vite-plus-ecosystem-ci/${{ matrix.project.name }}${{ matrix.project.directory && format('/{0}', matrix.project.directory) || '' }}
+        shell: bash
+        run: node $GITHUB_WORKSPACE/ecosystem-ci/verify-install.ts
+
       - name: Run vite-plus commands in ${{ matrix.project.name }}
         working-directory: ${{ runner.temp }}/vite-plus-ecosystem-ci/${{ matrix.project.name }}${{ matrix.project.directory && format('/{0}', matrix.project.directory) || '' }}
         run: ${{ matrix.project.command }}

ecosystem-ci/verify-install.ts

@@ -0,0 +1,34 @@
+import { createRequire } from 'node:module';
+
+const require = createRequire(`${process.cwd()}/`);
+
+const expectedVersion = '0.0.0';
+
+const packages = [
+  { name: 'vite', resolve: 'vite/package.json' },
+  { name: 'vitest', resolve: 'vitest/package.json' },
+  { name: 'vite-plus', resolve: 'vite-plus/package.json' },
+];
+
+let failed = false;
+
+for (const { name, resolve } of packages) {
+  try {
+    const pkg = require(resolve) as { version: string; name: string };
+    if (pkg.version !== expectedVersion) {
+      console.error(
+        `✗ ${name}: expected version ${expectedVersion}, got ${pkg.version} (${pkg.name})`,
+      );
+      failed = true;
+    } else {
+      console.log(`✓ ${name}@${pkg.version} (${pkg.name})`);
+    }
+  } catch {
+    console.error(`✗ ${name}: not installed`);
+    failed = true;
+  }
+}
+
+if (failed) {
+  process.exit(1);
+}