$mock = Mockery::mock('User');
$mock->shouldReceive('hasRole')->once()->andReturn(true); //works fine
$mock->roles = 2; //how to do this? currently returns an error
$this->assertTrue(someTest($mock));

protected $roles = array();

public function setRoles($roles)
{
    $this->roles = $roles;
}

public function addRole($role)
{
    $this->roles[] = $role;
}

$mock = Mockery::mock('User');
$mock->shouldReceive('hasRole')->once()->andReturn(true);
$mock->addRole(2);
$this->assertTrue(someTest($mock));

$mock = Mockery::mock('User[hasRole]');
$mock->shouldReceive('hasRole')->once()->andReturn(true);
$mock->roles = 2;
$this->assertTrue(someTest($mock));