dbc/tests

Decoder regression tests

Run from the repository root with a C++17 compiler:

g++ -std=c++17 -Wall -Wextra -Wpedantic -I. \
  tests/dbc_decoder_test.cpp dbc_decoder.cpp -o /tmp/dbc_decoder_test
/tmp/dbc_decoder_test

Alternatively, build the standalone qmake project out of source:

mkdir -p /tmp/dbc_decoder_test_build
cd /tmp/dbc_decoder_test_build
qmake /absolute/path/to/dbc/tests/dbc_decoder_test.pro
make
./dbc_decoder_test

The executable returns a nonzero exit code if any case fails. Checks remain active in release builds and do not depend on assert or an external test framework.

Coverage includes Motorola bit numbering within and across bytes, unaligned signals, signed values, scaling, 64-bit extraction, invalid lengths, insufficient payloads, and Intel regression cases. Frame validity means the definition was found; insufficient payloads are checked through signal validity.