Bump mutant-rspec from 0.16.3 to 0.17.0

[dependabot]

Bumps mutant-rspec from 0.16.3 to 0.17.0.

Changelog

Sourced from mutant-rspec's changelog.

v0.17.0 2026-09-17

• Add mutant-test-unit, an integration for test-unit. Tests declare the subjects they cover with cover, the same way mutant-minitest does, and run with --integration test-unit. See mutant-test-unit.

• Write the session file each time a mutation is found alive, not only at the end of the run. The session subcommands now see survivors while a long run is still going. Writes happen at most once per second.

• The minitest integration now also loads test files under minitest/, and skips any file under a vendor/ directory.

• Select tests from a per test coverage recording when there is one. Mutant selects a subject's tests by matching the subject's expression against each test's expression, which RSpec derives from the leading token of an example description. A spec headed describe 'clamping behaviour' covers Calculator#clamp without saying so, and its mutations report alive even though the suite kills them.

  Mutant now reads the per test data simplecov 1.2.0 and newer add to coverage/coverage.json under track_tests, and selects the tests that executed the subject's own source lines. It takes on no dependency for this, and reads coverage.json rather than the internal resultset, so it consumes simplecov's published schema.

  The default strategy is auto: use the recording when there is a usable one, and the expressions otherwise. Every run prints the strategy it settled on. --selection context_map turns every reason the recording cannot be used into a failed run, and --selection expression never reads it. --selection-path reads a report outside coverage. The same settings live under a selection key in mutant.yml.

  Subjects whose lines no test executes, such as a constant body evaluated while the suite loads, fall back to expression based selection.

  The selected tests are ordered likeliest killer first, by whether the expressions name the test, then by the share of the test's own footprint falling inside the subject, then by how much of the subject it reached. A run stops at the first failing test, so the order decides whether one test runs or all of them. Rspec picks its own order for groups and examples, so mutant installs an ordering strategy that follows the ranking. On a suite where thirty tests execute a subject incidentally and one asserts on it, this cut the examples run from 129 to 39.

  See Test Selection.

Commits

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