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* test(#4298): add tdd-walk.cjs end-to-end sniff-test harness for TDD dispatch Epic #4272 Phase 5's own checklist named this deliverable ("the same class of coverage loop-walk.cjs gives the loop") separately from #4268. Adds tests/qa/tdd-walk.cjs, extracting and REALLY EXECUTING (via a real `bash -c` subprocess against a real temp fixture project) the shipped bash resolution snippets from both TDD dispatch backends — never reimplementing or grep-simulating the predicate. Proves, by execution rather than text-shape assertion: the CLI predicate and both backends agree for a type: tdd plan and a plain plan; the worktree backend's fail-closed guard genuinely halts (non-zero exit, FATAL stderr) on a missing plan file; and the tdd.md embed ternary's condition tracks the real resolved value (#3800). This is exactly the class of proof #4264/#4265 (unassigned/divergent predicate) and #4268 (static-shape checks can't see backend divergence) could not provide. Extraction uses indexOf/slice on fenced-code markers only, never a backtracking regex over whole-file text (per the #4228 incident this repo's tests already document). Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> * test(#4298): scrub ambient env, tighten fail-closed assertion, fix comment Standards+Spec review found: (1) executeBackendScript spread raw process.env unfiltered into the spawned bash subprocess, unlike tests/helpers.cjs's runGsdTools, which deliberately scrubs SESSION_IDENTITY_ENV_KEYS + config-location env vars before spawning (#2665) — an ambient developer/CI override could silently change what phase.tdd-applicable resolves to in a way a gsd-test bench container won't reproduce; (2) the row-5 fail-closed test asserted only `stderr.includes('FATAL')`, which would also pass if the file's unrelated ISOLATION fail-closed guard fired instead of the TDD one; (3) a docstring called the worktree backend's first fenced block a "shim preamble" when it's actually the whole ISOLATION-resolution block. Fixes: spread the exported TEST_ENV_BASE (every scrub-listed key set to '') before the two intentional RUNTIME_DIR/GSD_TEST_MODE overrides; assert the exact TDD-applicability FATAL text; correct the docstring. Re-verified by direct execution against real fixtures — all three precedence-tier cases and the fail-closed case behave identically to before the fix. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> --------- Co-authored-by: sim <sim@local> Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>
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