Unit-тестирование от начинающего начинающим

class Users {
  public function getList() {
    $users = array();
    $result = mysql_query('SELECT * FROM users');
    while ($user = mysql_fetch_assoc($result) {
      $users[] = $user();
    }
  }
}

//...
    $users = new Users();
    $user_list = Users->getList();
    $this->assertEqual($expected, $user_list);
//...

class MySqlDb {
  public function query($query) {
    mysql_query($query);
  }

  public function fetch_assoc($result) {
    mysql_fetch_assoc($result);
  }
}

class Users {
  private $db;

  public function __construct(MySqlDb $storage) {
    $this->db = $db;    
  }

  public function getList() {
    $result = $db->query('SELECT * FROM users');
    $users = array();
    while ($user = $db->fetch_assoc($result) {
      $users[] = $user;
    }
  }
}

//...
    $db = new MySqlDb();
    $users = new Users($db);
    $user_list = Users->getList();
    $this->assertEqual($expected, $user_list);
//...

//...
    $db = $this->getMock('MySqlDb', array('query', 'fetch_object'));
    $db
      ->expects($this->once())
      ->method('query')
      ->with($this->equalTo('SELECT * FROM users'))
      ->will($this->returnValue(1275)); 
    $db
      ->expects($this->exactly(3))
      ->method('fetch_object')
      ->with($this->equalTo(1275))
      ->will($this->onConsecutiveCalls(
        array ('id' -> 1, 'name' -> 'Alice'), 
        array ('id' -> 2, 'name' -> 'Bob'), 
        false 
      ); 
    $users = new Users($db);
    $user_list = Users->getList();
    $this->assertEqual($expected, $user_list);
//...