public function testLimitMapCollector()
{
$array = ['a' => 1, 'b' => 2, 'c' => 3, 'd' => 4, 'e' => 5, 'f' => 6];
$stream = new Stream($array);
$stream->limit(2);
$res = $stream->collect(new MapCollector());
$this->assertEquals(['a' => 1, 'b' => 2], $res);
}
