[boost] How do I run the tests for a specific library using bjam?

I notice that all the boost libraries have tests associated with them, which can be invoked by bjam somehow. Can someone tell me how to invoke bjam to run a specific test for a given (single) library, or run the whole suite of tests for the single library? As opposed to running all tests for all libraries. Alternatively, if you could point me to some docs which describe it, I can take it from there. (I did some searching but have struck out so far). Thanks