ODB and Testing

i'm a c++ newbee and looking for a test framework for my new project, where i started to use ODB. i have a simple project structure like this:

project

-modules

-includes

-src

-ORM

-test

and now i wanna know, which test framework you would recommend from your experiences, which i could easy include in my project and test my code. I already read about googletest,the examples are written for applications with two different executables. Is it possible to use only one executable and start the test independent or should i use two different executables? That's what i'm looking for. I would keep it simple as possible.