public function testRandom()
{
$data = new Collection([1, 2, 3, 4, 5, 6]);
$random = $data->random();
$this->assertInternalType('integer', $random);
$this->assertContains($random, $data->all());
$random = $data->random(3);
$this->assertInstanceOf('Collection\\Collection', $random);
$this->assertCount(3, $random);
}