C++ not having a "default" unit testing framework that pretty much ships with all the IDEs hurts it a lot - the other factor is changing culture, I think. Even

C++ not having a "default" unit testing framework that pretty much ships with all the IDEs hurts it a lot - the other factor is changing culture, I think. Even fifteen years ago unit tests were a pretty alien thing to most folks and a lot of software in C++ has a very long lifespan. It's really hard to build momentum in an organization to actually set aside the time to write unit test coverage over existing code.