Original statement: > But lack of automated regression testing would have caught this issue. Your question: > To explain myself, I meant that tests that were

Original statement: > But lack of automated regression testing would have caught this issue. Your question: > To explain myself, I meant that tests that were succeeding previously would have failed due to this issue if we had tests written for it. Does my statement not convey this? No. The sentence says that the lack (i.e. not having) tests would have caught the issue. If you remove 'But lack of', the sentence makes sense ;)