1.
잘못 누른 키보드 버튼 하나가 부른 버터플라이 이펙트?

2.
30일간 스택 오버플로우에 활동한 경험

3.
테스트 코드에 로직을 넣지 말아라

Unlike production code, simplicity is more important than flexibility in tests

Tests can avoid complexity by stating their inputs and outputs directly rather than computing them

When tests do need their own logic, such logic should often be moved out of the test bodies and into utilities and helper functions