function testUnregisterComponent()
{
$pico = new DefaultPicoContainer();
$pico->registerComponentInstance(new SimpleTouchable());
$t = $pico->getComponentInstance('SimpleTouchable');
$this->assertNotNull($t);
$pico->unregisterComponent('SimpleTouchable');
$t = $pico->getComponentInstance('SimpleTouchable');
$this->assertNull($t);
}