Now really try to fix the thing

scripts/e2eTestsOnVsix/install_extension.js

@@ -1,3 +1,4 @@
+'use strict'
 const core = require('@actions/core')
 const vscodeTest = require('@vscode/test-electron')
 const childProcess = require('child_process')
@@ -21,19 +22,7 @@ async function installExtension({ extensionType, extensionVersion }) {
     console.debug({ cli })
     console.debug({ args })
 
-    if (process.platform === 'win32' && cli.endsWith('.cmd')) {
-      args.unshift(cli)
-      cli = 'cmd.exe'
-    }
-
-    const result = childProcess.spawnSync(
-      cli,
-      [...args, '--install-extension', `${extensionName}@${extensionVersion}`],
-      {
-        encoding: 'utf-8',
-        stdio: 'pipe',
-      },
-    )
+    const result = spawnVscode(cli, ['--install-extension', `${extensionName}@${extensionVersion}`])
     console.log(result)
     if (result.stderr.includes('Failed')) {
       console.log("It's not ready to be installed yet.")
@@ -49,6 +38,18 @@ async function installExtension({ extensionType, extensionVersion }) {
   }
 }
 
+function spawnVscode(cmd, args) {
+  if (process.platform === 'win32' && cmd.endsWith('.cmd')) {
+    args = [cmd, ...args]
+    cmd = 'cmd.exe'
+  }
+
+  return childProcess.spawnSync(cmd, args, {
+    encoding: 'utf-8',
+    stdio: 'pipe',
+  })
+}
+
 module.exports = { installExtension }
 
 if (require.main === module) {