test: update test coverage for ad7768 and ad7768-4 #67

All 255 tests pass, 1 181 skipped in 9m 14s

1 436 tests ±0   255 ✔️ ±0 9m 14s ⏱️ +3s
      1 suites ±0 1 181 💤 ±0
      1 files ±0       0 ❌ ±0

Results for commit d6a0c73. ± Comparison against earlier commit 834bc87.