If you find bugs in 3rd party components whilst testing, of course you try and do something about it. The point is, at some point you have to trust that the com

If you find bugs in 3rd party components whilst testing, of course you try and do something about it. The point is, at some point you have to trust that the components you're working with are relatively bug-free otherwise every application will end up testing all the features of the OS it sits upon. Do you really expect developers to run a full test suite for Windows every time they develop a painting application? Note that I'm talking about actively looking for bugs, not the bugs that are apparent from some happy path testing.