| 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. |
