yosys/tests/functional/README.md

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Tests for the functional backend use pytest as a testrunner.
Run with `pytest -v`
Pytest options you might want:
- `-v`: More progress indication.
- `--basetemp tmp`: Store test files (including vcd results) in tmp.
CAREFUL: contents of tmp will be deleted
- `-k <pattern>`: Run only tests that contain the pattern, e.g.
`-k cxx` or `-k smt` or `-k demux` or `-k 'cxx[demux`
- `-s`: Don't hide stdout/stderr from the test code.
Custom options for functional backend tests:
- `--per-cell N`: Run only N tests for each cell.