public function testModify()
{
list($handler, $repo, $auth, $keygen) = $this->getMocks();
$mockFile = m::mock('Xpressengine\\Storage\\File');
$repo->shouldReceive('update')->once()->with($mockFile)->andReturn($mockFile);
$instance = new Storage($handler, $repo, $auth, $keygen);
$file = $instance->modify($mockFile);
$this->assertInstanceOf('Xpressengine\\Storage\\File', $file);
}
