Added test cases for https://github.com/wso2-enterprise/wso2-apim-internal/issues/571 .

[prasa7]

No description provided.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}