add `check_ard_structure()` unit tests #306

All 105 tests pass, 32 skipped in 1m 4s

1 files ±0 138 suites ±0 1m 4s ⏱️ ±0s
137 tests ±0 105 ✅ ±0 32 💤 ±0 0 ❌ ±0
532 runs ±0 488 ✅ ±0 44 💤 ±0 0 ❌ ±0

Results for commit 2ea7e33. ± Comparison against earlier commit 670dc6d.