Collections\Collection::tail PHP Method

    public function tail()
    {
        return $this->slice(1, $this->count());
    }

 public function test_that_tail_gives_you_everything_but_head()
 {
     $col = new Collection('int', [1, 2, 3]);
     $tail = $col->tail();
     $this->assertEquals(2, $tail->count());
     //col shouldn't be changed and should have 3 items
     $this->assertEquals(3, $col->count());
     //check that tail has two and three
     $this->assertEquals(2, $tail->at(0));
     $this->assertEquals(3, $tail->at(1));
 }