Robert Martin is the dude that said the only acceptable target is 100%. Of course he also said you shouldn't plan to actually hit that target, just get as close as is possible without having to test things that don't matter like frameworks.

Kent Beck recently went through and clarified TDD and he definitely doesn't advocate 100%. https://youtube.com/playlist?list=PLlmVY7qtgT_lkbrk9iZNizp97...