public function testDataPopulate()
{
$fs = new Fieldset();
$fs->setName('customers');
$ele1 = new Element('first_name', 'text');
$ele2 = new Element('last_name', 'text');
$ele3 = new Element('address', 'textarea');
$fs->addElement($ele1);
$fs->addElement($ele2);
$fs->addElement($ele3);
$fs->populateData(['first_name' => 'Sahan', 'last_name' => 'HH']);
$this->assertEquals('Sahan', $fs->getElement('first_name')->getValue());
$this->assertEquals('HH', $fs->getElement('last_name')->getValue());
}