public function testRemoveBlankElements()
{
$input = array(1, 2, null, 'test', '', 2);
$output = ArrayUtil::removeBlankElements($input);
$this->assertEquals(4, count($output));
$this->assertEquals(1, $output[0]);
$this->assertEquals(2, $output[1]);
$this->assertEquals('test', $output[3]);
$this->assertEquals(2, $output[5]);
}