Closes

tests/README.md

@@ -50,6 +50,10 @@ error paths and line numbers, and integration with signals and comments.
 Signal tests cover complete syntax and numeric validation, scientific notation,
 finite physical parameters and ordered ranges, spaces and tabs, receiver lists,
 unsupported multiplexing, and Intel/Motorola declared-payload boundaries.
+Value-description tests cover full `VAL_` syntax, whitespace, escaped quotes,
+empty text, exact integer boundaries, duplicate keys within and across statements,
+deferred and normalized frame references, missing targets, error locations,
+raw lookup with scaling, unknown/invalid values, and both database builders.
 Temporary DBC fixtures are created in the system temporary directory and removed
 automatically.