fix(hmr-websocket): small fix

Author: lbogdan

packages/@vue/cli-test-utils/createTestProject.js

@@ -17,7 +17,7 @@ module.exports = function createTestProject (name, preset, cwd, initGit = true)
     return fs.existsSync(path.resolve(projectRoot, file))
   }
 
-  if (has(projectRoot)) {
+  if (has(name)) {
     console.warn(`An existing test project already exists for ${name}. May get unexpected test results due to project re-use`)
   }