610c8e3709
A scripted fake ACP agent bin (tests/fixtures/fake-acp-agent.ts) speaks real newline JSON-RPC through the REAL runScenario spawn path (tsx loader, temp cwd, env plumbing); every behavior — prompt outcome, session/new rejection, persisted logs, filesystem noise — comes from a behavior.json beside the fixture, so specs script whole subprocess runs from data. harness.spec.ts drives every step op, both expect-error arms, the permission-stub default, env forwarding, workspace seeding, and the harvest ordering/noise/fallback branches. suite.spec.ts runs the factory for real at collection time: a replay suite over committed synthetic fixtures and a record suite over a temp copy (write-back never touches the committed tree; ACP_SNAPSHOT_SPEC_BOOTSTRAP=1 re-bootstraps it), plus direct cases for the exported pure helpers. The suite factory's pure helpers (childFixturePaths, fixtureContext, normalizedHeaders, headerDeltaCount) are exported for those direct specs. Two branches carry justified v8 ignores, both structurally unreachable: the waiter in-bounds guard (noUncheckedIndexedAccess) and waitForExit's already-exited race guard (both call sites sit one synchronous frame after stdin.end()/kill()). The fake bin substitutes the session/new cwd, not process.cwd(), into scripted logs — the realpath difference (/private on darwin) is exactly what the real bin's header carries. packages/support/acp-snapshot/src is at 100% statements, branches, functions, and lines under the per-file gate.
support/ — dev/test/example infrastructure
Packages that exist to serve development, testing, and the examples rather than to ship as product API. They are real workspace packages (typed, tested, under the coverage gate), but they carry lower compatibility expectations: they may change or be removed when the development need behind them does, without the deprecation care a product package would warrant.
| Package | Role | ctx key |
|---|---|---|
acp-snapshot/ |
ACP snapshot suite kit: subprocess scenario harness + golden normalizers + the defineAcpSnapshotSuite factory |
(library — imported by example *.snapshot.ts suites) |
invariants/ |
Dev-mode event-contract invariants + session-log freeze | (listens on session/*, agent/*) |
llm-replay/ |
Record/replay adapter: short-circuits llm/stream from a recorded session JSONL (keyless snapshot tests) |
(listens on llm/stream) |
subagent-mock/ |
Scripted SubagentProvider for deterministic seam/tool tests |
(registers on ctx.subagents) |
invariants runs only in dev mode (contract checks, not runtime behavior). llm-replay backs the demos and the snapshot test tier under the per-file coverage gate. acp-snapshot carries the snapshot tier's harness/normalizer/suite machinery so every example's suite is a scenario table over one shared, gate-covered implementation. subagent-mock exercises the real ctx.subagents load path without a model or child agent. A package graduates OUT of support/ into a product group only when it gains documented product consumers.