public function testIsEmpty() { $container = new Configuration(); $this->assertTrue($container->isEmpty()); $container->foo = 'bar'; $this->assertFalse($container->isEmpty()); unset($container->foo); $this->assertTrue($container->isEmpty()); $container['foo'] = 'bar'; $this->assertFalse($container->isEmpty()); unset($container['foo']); $this->assertTrue($container->isEmpty()); }