Multisite domain mapping on wordpress not create sub domain ?

Multisite domain mapping on wordpress not create sub domain ?

We create MultiSite with the help of WordPress MU Domain Mapping plugin in
wordpress.
We setup my localhost as virtual host like example.com then create network
admin Dashboard and install WordPress MU Domain Mapping and setup the
Domain Mapping Configuration assign the server IP Address for localhost
127.0.0.1 and server CNAME domain as Blank.In Domain Mapping: setup
provide Site ID which i create in site name test and Domain name like
test.example.com then save it. After logout with admin and login with test
user and when go on test user Dashboard go on my site option there show
test.example.com and click on dashboard url open test.example.com but show
like its Sorry, the website test.example.com cannot be found.
So please can any one help mi out i stock at that problem from last 3 days
. I want create this setup on localhost.
Thanks Advance !