Do you mean is Testnet4 finished? The answer is yes: TEST network 4 - complete
This network, community1, is operational but in the sense that the two hard-coded contacts in the config are running (last I checked). But it is not fully functional because of the crippled nature of the test binaries - disabled cache, limitation of number of vaults on a LAN - which make it difficult to achieve a quorum. Without a quorum, newly stated vaults tend to die.
That means that, with a large expenditure of time I might find workarounds to these difficulties and have a fully functional network. But I don’t have that time at present. Things will get better, that’s all I can say for now.
There’s also the developer network (stable droplet network) described elsewhere on the forum, if you just want to run client software.