test: add test coverage for util functions #615

All 268 tests pass in 3m 46s

    1 files ±0   84 suites +1 3m 46s ⏱️ -2s
268 tests +5 268 ✔️ +5 0 💤 ±0 0 ❌ ±0
272 runs +6 272 ✔️ +6 0 💤 ±0 0 ❌ ±0

Results for commit 593dc06. ± Comparison against earlier commit 5db6453.