Prompt validation does not visualize the output (errors)

using inquirer a prompt with validate function should show the validate output, but with vorpal it is somehow omitted.

this.prompt([
    {
        type: 'input',
        name: 'test',
        message: 'Please type something different than `test` to see an error pop up... or type `test` to continue',
        validate: function (val) {
            if (val != 'test') {
                return "Please answer with the word test";
            }
            return true;
        }
    }
], function(answers) {
    console.log(answers);
});

in Inquirer you can see this work perfectly in the examples/input.js example. however the error gets lost somewhere in the process within vorpal I assume.