Add test case covering import/export of archives with prefix junk data #943

All 379 tests pass, 6 skipped in 26s

54 files +1 54 suites +1 26s ⏱️ +2s
385 tests +1 379 ✅ +1 6 💤 ±0 0 ❌ ±0
396 runs +1 390 ✅ +1 6 💤 ±0 0 ❌ ±0

Results for commit 30f5f2d. ± Comparison against earlier commit 52bf692.