Asserting displayValue of ComboBox

combobox.js

Ext.define('Sandbox.view.test.combobox.Base', {
    extend: 'Ext.form.field.ComboBox',
    id: 'futureCmp',
    displayField: 'text',
    valueField: 'id',
    store: {
        fields: ['id', 'text'],
        data: [
            [1, 'Apples'],
            [2, 'Oranges']
        ]
    }
});

pageobject.js

var PO = {
    combo: function () {
        return ST.comboBox('@futureCmp');
    },
    displayValue: function (value) {
        return this.combo()
            .execute(function (cmp) {
                var record = cmp.findRecordByDisplay(value);
                return record ? record.get('id') : false;
            }).and(function () {
                var future = this.future,
                    id = future.data.executeResult;
                future.setValue(id);
                // assert that the value has been correctly selected
                future.value(id);
            });
    }
}

spec.js

it('should select correct value from displayField', function () {
    // We have a single method on our page object that encapsulates some complex logic
    PO.displayValue('Oranges');
});