运行主机组的ansible playbook-没有匹配的主机

ansible -i /home/linux/ansible/my-prereqs/hosts  -m ping 'test'


172.16.57.101 | SUCCESS => {
    "changed": false, 
    "ping": "pong"
}

我的主机清单文件位于 /home/linux/ansible/my-prereqs/hosts

我的库存文件如下

[ansible-vm]
172.16.57.102

**[test]**
172.16.57.101

现在我想运行一个剧本,但我无法按库存组运行它们

ansible-playbook  -i /home/linux/ansible/my-prereqs/hosts  -l test my-prereqs.yaml 

but I get the following 


PLAY ***************************************************************************
skipping: no hosts matched

PLAY RECAP *********************************************************************