I don't think even the most hardcore TDD zealots would come anywhere close to claiming that testing is a silver bullet. There will always be cases where you did

I don't think even the most hardcore TDD zealots would come anywhere close to claiming that testing is a silver bullet. There will always be cases where you didn't think of a particular edge case, or when some environment-based issue makes covering something in a test impossible. That doesn't negate it's benefits in preventing the 99% percent of bugs that aren't an insanely rare edge case.