The tests in this directory are shared by two different test modes, and can be run in multiple different ways: - `./x.py test coverage-map` (compiles to LLVM IR and checks coverage mappings) - `./x.py test coverage-run` (runs a test binary and checks its coverage report) - `./x.py test coverage` (runs both `coverage-map` and `coverage-run`) ## Maintenance note These tests can be sensitive to small changes in MIR spans or MIR control flow, especially in HIR-to-MIR lowering or MIR optimizations. If you haven't touched the coverage code directly, and the tests still pass in `coverage-run` mode, then it should usually be OK to just re-bless the mappings as necessary with `./x.py test coverage-map --bless`, without worrying too much about the exact changes.