# Decoder regression tests

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

```sh
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:

```sh
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.