public function testPluginRegistry()
{
$this->_storage = $this->getMockForAbstractAdapter();
$plugin = new \ZendTest\Cache\Storage\TestAsset\MockPlugin();
// no plugin registered
$this->assertFalse($this->_storage->hasPlugin($plugin));
$this->assertEquals(0, count($this->_storage->getPluginRegistry()));
$this->assertEquals(0, count($plugin->getHandles()));
// register a plugin
$this->assertSame($this->_storage, $this->_storage->addPlugin($plugin));
$this->assertTrue($this->_storage->hasPlugin($plugin));
$this->assertEquals(1, count($this->_storage->getPluginRegistry()));
// test registered callback handles
$handles = $plugin->getHandles();
$this->assertCount(2, $handles);
// test unregister a plugin
$this->assertSame($this->_storage, $this->_storage->removePlugin($plugin));
$this->assertFalse($this->_storage->hasPlugin($plugin));
$this->assertEquals(0, count($this->_storage->getPluginRegistry()));
$this->assertEquals(0, count($plugin->getHandles()));
}