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rust/tests/coverage
许杰友 Jieyou Xu (Joe) f13cd0c8d0 Rollup merge of #124053 - Zalathar:lazy-boolean, r=Mark-Simulacrum
coverage: Branch coverage tests for lazy boolean operators

The current branch coverage implementation already supports the `&&` and `||` operators (even outside of an `if` condition), as a natural consequence of how they are desugared/lowered, but we didn't have any specific tests for them. This PR adds some appropriate tests.

I've also moved the existing branch coverage tests into a `coverage/branch` subdirectory, so that they don't become unwieldy as I add more branch coverage tests.

``@rustbot`` label +A-code-coverage
2024-04-20 21:45:36 +01:00
..
2023-12-24 20:08:57 +00:00
2024-02-09 21:13:51 +00:00
2024-02-09 21:13:51 +00:00
2024-04-20 00:34:40 +08:00
2024-02-09 21:13:51 +00:00
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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.