It won't trigger exception handling that hasn't been written because you forgot to check a certain sort of bad input. In that case, you may still get 100% code

It won't trigger exception handling that hasn't been written because you forgot to check a certain sort of bad input. In that case, you may still get 100% code coverage, which many will erroneously take to mean that all possible behaviors are verified. 100% code coverage can _never_ be taken, as a figure, to indicate that testing is comprehensive.