Editing a pre-existing test application to use the GTEST framework

[Hussain1811]

My requirement might seem a bit odd. But here it goes:
I have a test application (which contains many command line arguments) which uses the APIs exposed by a library. The library in-turn talks to a driver which finally talks to an IP.

As the test application is already present, my goal is to just run this test app. But, the catch is, i would like to run it using the GTEST framework. Basically i would like the pre-existing test app to use the GTEST framework.

Is such a thing possible or should i be writing a separate test application which uses the library APIs?

[Hussain1811]

Could anybody guide me here?