What does 99% Test Coverage mean?

99 % Test Coverage means NOTHING

Yup, absolutely fucking nothing. Unless you have got your test properly reviewed for quality. Then, perhaps you have got some safety-net and liberty to refactor mercilessly.

Now think Hard about the next question.

What does 12% code coverage mean?

Yes? any guesses?

Take few deep breaths before you proceed.

Does it mean nothing?

Think Again!

Does it mean that you have got some safety-net?

Nopes!

All it means that you have got some tests missing

That's all folks.