Changing domain link without moving WordPress?

Hi,

I have a website here: http://noronhagroup.in/test/ which was uploaded for preview purpose for the client. Now that the client has agreed upon the changes, I want to host it to the main domain which is: http://noronhagroup.in/ is there any way, where I can do some changes to a particular file (or settings) without actually going through the process of uploading entire WordPress from /test to the main?
I am sure there will be a work around here. Also I am looking for redirecting the domain as it redirects to /test while client needs the domain as: http://noronhagroup.in/

Any help will be much appreciated.

Thank you,