Code sample for http://blog.glenjamin.co.uk/shared-behaviours-in-phpunit-with-traits

Single_AppleList.php

<?php
namespace Example\Single;

class AppleList
{

  private $data = [];
  private $sort = [];

  public function __construct(array $data, array $sort)
  {
    $this->data = $data;
    $this->sort = $sort;
  }

  public function items()
  {
    foreach ($this->sort as $key) {
      yield new Apple($this->data[$key]);
    }
  }

  public function length()
  {
    return count($this->data);
  }

}

class Apple
{

  private $id;

  public function __construct(array $data) {
    $this->id = $data['id'];
  }

  public function getId()
  {
    return $this->id;
  }
}