Context
From the first complete full mutation-testing run (ADR-007 shared workflow, run 29074771985, 2026-07-10, main @ 94a5d44). The public testkit::slow_io pacing utility ships to consumers, so its validation boundaries and pacing behaviour warrant direct tests.
Surviving mutants
src/testkit/slow_io.rs:105 — replace > with >= in SlowIoConfig::validatesrc/testkit/slow_io.rs:123 — replace > with >= in validate_pacing_chunk_sizesrc/testkit/slow_io.rs:138 — replace && with || in pause_between_chunkssrc/testkit/slow_io.rs:164 — replace < with <= in write_with_optional_pacing
Analysis
Validation is only tested strictly beyond its limits, never at them, and no test measures the pacing schedule itself, so the pause-gating conjunction and the final-chunk comparison can be flipped freely.
Suggested tests
- Assert a configuration with capacity exactly at the maximum validates successfully (kills line 105).
- Assert
chunk_size == capacity is accepted (kills line 123).
- Under
tokio::time::pause (start-paused), perform a paced write spanning several chunks and assert the total virtual delay equals (chunks - 1) * delay — pauses between chunks but not after the last (kills lines 138 and 164).
Context
From the first complete full mutation-testing run (ADR-007 shared workflow, run 29074771985, 2026-07-10,
main@ 94a5d44). The publictestkit::slow_iopacing utility ships to consumers, so its validation boundaries and pacing behaviour warrant direct tests.Surviving mutants
src/testkit/slow_io.rs:105—replace > with >=inSlowIoConfig::validatesrc/testkit/slow_io.rs:123—replace > with >=invalidate_pacing_chunk_sizesrc/testkit/slow_io.rs:138—replace && with ||inpause_between_chunkssrc/testkit/slow_io.rs:164—replace < with <=inwrite_with_optional_pacingAnalysis
Validation is only tested strictly beyond its limits, never at them, and no test measures the pacing schedule itself, so the pause-gating conjunction and the final-chunk comparison can be flipped freely.
Suggested tests
chunk_size == capacityis accepted (kills line 123).tokio::time::pause(start-paused), perform a paced write spanning several chunks and assert the total virtual delay equals(chunks - 1) * delay— pauses between chunks but not after the last (kills lines 138 and 164).