public function testSearch()
{
$iter = new \ArrayIterator(['foo', 'bar', 'baz']);
$this->assertSame('baz', search(fn\operator('===', 'baz'), $iter));
$iter = new \ArrayIterator(['foo', 'bar', 'baz']);
$this->assertSame(null, search(fn\operator('===', 'qux'), $iter));
$iter = new \ArrayIterator([]);
$this->assertSame(null, search(fn\operator('===', 'qux'), $iter));
}