Can I get any testcase related to the same?

I would like to apologize, however, I'm not sure how exactly would you want to test case the instructions given in the guide — Prepopulating-Fields-to-Your-JotForm-via-URL-Parameters

I'm going to give it a try but please let us know if I misunderstood your concern.

There is a Sample Form that is given in the guide.

https://form.jotform.com/53533976064967

Let's say, for example, you would like the fields in that form to be filled with data when accessed. You can prefill the fields using URL parameters as explained in the guide.

If I want to pre-fill every field on the Full Name field, I'll have the following parameters included on the form link.

https://form.jotform.com/53533976064967?fullName[prefix]=Dr.&fullName[first]=John&fullName[middle]=Doe&fullName[last]=Smith&fullName[suffix]=M.D.

The parameter value I set after the equal symbol "=" will be the value that will appear on the form when I click the link above.

The instruction on how you can create such a link is explained in the guide.

Another guide that you may find useful and is also related to the guide above is this one — How-to-Automatically-Pass-Form-Data-to-Another-Form

Feel free to contact us anytime if you have other questions or concerns.