Closes #15

tests/README.md

@@ -50,7 +50,12 @@ Coverage includes Motorola bit numbering within and across bytes, unaligned
 signals, signed values, scaling, 64-bit extraction, signed/unsigned boundary values
 (including `INT64_MIN`, `INT64_MAX`, and `UINT64_MAX`), numeric output, invalid lengths, insufficient
 payloads, and Intel regression cases. Frame validity means the definition was
-found; insufficient payloads are checked through signal validity.
+found; frame status reports unknown frames, short payloads, and signal errors.
+Tests exercise empty/short/exact/long payloads, ignored trailing bytes, signals
+outside declared DLC, invalid enum metadata and overflowing start bits, and
+preservation of successful signals. Physical conversion checks cover NaN/Inf
+parameters, multiplication/addition overflow, finite limits, signed/unsigned raw
+retention, and raw selector activation after physical conversion failure.
 
 ## Parser coverage