public function testDefinition()
{
$container = new ContainerBuilder();
$demo = new Definition('Demo');
$container->addDefinition(array('service1' => $demo, 'service2' => new Definition('Demo2')));
$this->assertTrue($container->hasDefinition('service1'));
$this->assertTrue($container->hasDefinition('service2'));
$this->assertSame($demo, $container->getDefinition('service1'));
$container->replaceDefinition(array('service3' => $demo));
$this->assertFalse($container->hasDefinition('service1'));
$this->assertTrue($container->hasDefinition('service3'));
$this->assertSame($demo, $container->getDefinition('service3'));
}