public function test_first()
{
$string = 'Hello, World!';
$this->assertEquals('H', Helper::first($string));
$array = array(1, 2, 3);
$this->assertEquals(1, Helper::first($array));
$arrayIterator = new \ArrayIterator($array);
$this->assertEquals(1, Helper::first($arrayIterator));
$object = new \StdClass();
$object->foo = 'foo';
$object->bar = 'bar';
$this->assertEquals('foo', Helper::first($object));
$this->assertEquals(42, Helper::first(array(), 42));
}
