无法为变量赋值

var readline = require('readline');
var test
rl = readline.createInterface(process.stdin, process.stdout);
rl.question('What is your favorite food?', function(answer) {
 console.log('Oh, so your favorite food is ' + answer);
 test = answer
});
rl.close()

webdriverio
 .remote(options)
 .init()
 .url('https://www.google.com')
 console.log(test) //undefined, why?
var readline = require('readline');
var test
rl