Nested field validation

package.json

{
  "name": "nested_fields",
  "version": "0.0.1",
  "private": true,
  "dependencies": {
    "forms": "1.1.0"
  }
}

test.js

assert = require('assert');
forms = require('forms');

var form = forms.create({
    userDetails: {
        username: forms.fields.string({required: true}),
        password: forms.fields.password({required: true})
    }
});

var data = { userDetails: {} };

function callback(f) {
    assert.equal(
        'Username is required.',
        f.fields.userDetails.fields.username.error,
        'Expected validation failure on username field'
    ); // this assertion passes

    assert(!f.isValid(), 'Expected form validation error'); // <-- we fail here
}

form.handle(data, {
    success: function(f) {
        callback(f);
        assert.fail('Unexpected success callback')
    },
    other: callback
});