Fixed SIGSEGV

tests/README.md

@@ -40,14 +40,15 @@ make
 make check
 ```
 
-`parser_tests.pri` and `decoder_tests.pri` include the original test sources;
+`parser_tests.pri` includes `dbc_parser_test.cpp` and `dbc_statement_test.cpp`;
+`decoder_tests.pri` includes the decoder test source;
 `tests.pro` also includes `dbc_coverage_test.cpp`, `dbc_lifetime_test.cpp`,
 `dbc_validation_test.cpp`, and `dbc_pipeline_test.cpp`.
 `../core/core.pri` supplies the library include path and linkage.
 
 ## Local regression checks
 
-`run_core_ci.sh` builds the core archive, runs all six QtTest suites and the
+`run_core_ci.sh` builds the core archive, runs all seven QtTest suites and the
 qmake tree target with `make check`, then compiles and runs the standalone C++17
 tree/builder test without Qt. A failed command returns a nonzero status. The
 `sanitize` mode applies ASan/UBSan flags to core, tests, and the standalone
@@ -295,6 +296,28 @@ Attribute changes were verified with `qmake6 ../dbc.pro`, `make -j4`, and
 passed. The standalone C++17 tree test also passed. The existing named
 comma-decimal C locale test skipped because the locale is not installed.
 
+## Long value descriptions and multiplex ranges
+
+`dbc_statement_test.cpp` adds a separate `StatementParserTest` suite to the
+existing parser qmake source list and the main test runner. Both parser APIs are
+checked with 50,000-character descriptions (including quotes, backslashes,
+semicolons, and spaces), 10,000 `VAL_` pairs, 10,000 multiplex ranges, and long
+numeric bounds and whitespace. Valid metadata must survive parsing without
+truncation, support value-description lookup after decoding, and activate or
+skip multiplex branches correctly. Statements may precede or follow definitions.
+
+Malformed long statements cover incomplete quotes/escapes, invalid escapes,
+missing separators and semicolons, duplicate keys, numeric overflow, empty and
+reversed ranges, trailing text, and unresolved long names. The diagnostic API
+must return an empty database with the correct category, path, and source line;
+the throwing API must report that same location.
+
+Verified with Qt 6.8.2 in separate Release and ASan/UBSan builds with
+`CONFIG+=dbc_qt`: each passed 2,449 core QtTest checks (including 29 checks in the
+new suite), seven model checks, and the qmake tree test. One named-locale case
+skipped because the locale is unavailable. Sanitizer errors were fatal; local
+leak checking used `detect_leaks=0` because of the documented ptrace restriction.
+
 ## Unsupported signal value types
 
 `unsupportedSignalValueTypes` verifies that both parser APIs reject `SIG_VALTYPE_`