hide OPEN message on test

lib/core/nuxt.mjs

@@ -127,12 +127,14 @@ export default class Nuxt {
           }
 
           const _host = host === '0.0.0.0' ? 'localhost' : host
-          // eslint-disable-next-line no-console
-          console.log(
-            '\n' +
+          if (!this.options.test) {
+            // eslint-disable-next-line no-console
+            console.log(
+              '\n' +
               chalk.bgGreen.black(' OPEN ') +
               chalk.green(` http://${_host}:${port}\n`)
-          )
+            )
+          }
 
           // Close server on nuxt close
           this.hook(