How to switch Authorized.net payment gateway in test mode?

Question: How can I switch  Authorize.NET account in TEST mode?

Solution:
Login into HC as "Host/Reseller".

Follow the steps below to switch Authorize.Net Gateway in Test mode:

1. Go to My Server :: Payment Gateways Settings.
2. Select Authorize.Net from the list and click Configure Gateway.
3. In the form you will now be able to see the new field Test Transaction (Enter TRUE for test and FALSE for live).
4. Give TRUE in its value.

Now you have Authorize.NET configured in TEST mode on your server. You can test Auto Signup as well as Payment Service.