Using CppUnit 2 with legacy CppUnit 1 unit tests
CppUnit2 is implemented in a different namespace (CppUT). This allows both frameworks to be used in the same programs at the same time.
OpenTest is designed to integrate multiple unit test frameworks together. Allowing test written with CppUnit1 to be tested along with test written with CppUnit2 is as "simple" as implementing an OpenTest/TestRunner for both framework and registering them to the same OpenTest/TestDriver.