[BE] refactor: MockData 설정 로직 리팩터링 및 테스트 속도 개선 (#839) #742

All 655 tests pass in 23s

196 files ±0 196 suites ±0 23s ⏱️ -1s
655 tests ±0 655 ✅ ±0 0 💤 ±0 0 ❌ ±0
668 runs ±0 668 ✅ ±0 0 💤 ±0 0 ❌ ±0

Results for commit c717a6d. ± Comparison against earlier commit 8bdbf65.