if you are using windows, take a look at: Limitations of using C++/CLI with NUnit and write your tests in http://en.wikipedia.org/wiki/Managed_Extensions_for_C%2B%2B.
also: http://golios.blogspot.com/2008/12/using-nunit-with-c-part-2.html, http://golios.blogspot.com/2008/11/using-nunit-with-native-c.html
this will work just like junit except for the fact that nunit does not create a new instance of the test case class before running each test.