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test(acp): snapshot cancelled queued tool calls

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This commit is contained in:
Tianyi Cui
2026-07-19 13:03:31 +08:00
parent 954c2ad2b5
commit edaaa50fe3
8 changed files with 93 additions and 15 deletions
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24
packages/support/acp-snapshot/src/harness.ts
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@@ -37,11 +37,10 @@ export type { AgentUnderTest } from './launcher.ts'
* (random) session id into a `{{sessionId}}` variable that later steps
* reference, since a committed file cannot know the id in advance.
*
* `promptAndCancel` sends a prompt WITHOUT awaiting its response, waits until
* the client observes the first streamed `agent_message_chunk` (so the emitted
* frames deterministically precede the cancellation), then cancels the turn —
* the only way to exercise a cancel deterministically (a plain `prompt` step
* awaits the response, which a cancel/hang scenario would block on forever).
* `promptAndCancel` starts a prompt without awaiting completion, waits until
* the client observes the selected update (`agent_message_chunk` by default),
* then cancels and awaits completion. This keeps update/cancel order
* deterministic for fixtures that a plain `prompt` cannot drive.
*/
export type InputStep =
| { op: 'initialize'; terminalOutput?: boolean }
@@ -49,7 +48,7 @@ export type InputStep =
| { op: 'newSessionExpectError'; additionalDirectories?: string[] }
| { op: 'prompt'; text: string }
| { op: 'promptExpectError'; text: string }
| { op: 'promptAndCancel'; text: string }
| { op: 'promptAndCancel'; text: string; afterUpdate?: 'agent_message_chunk' | 'tool_call' }
| { op: 'cancel' }
| { op: 'setConfigOption'; configId: string; value: string }
| { op: 'setConfigOptionExpectError'; configId: string; value: string }
@@ -342,15 +341,12 @@ async function runStep(
case 'promptAndCancel': {
const sessionId = getSessionId()
if (sessionId === undefined) throw new Error('snapshot-harness: promptAndCancel before newSession')
// Dispatch the prompt WITHOUT awaiting (a hang fixture never resolves on
// its own). To pin frame order deterministically, wait until the client
// has OBSERVED the hang's streamed agent_message_chunk before cancelling —
// so those update frames always precede the cancelled prompt response in
// the transcript (without this, the late chunk and the response race).
// Then cancel and await the prompt, which the bridge settles as
// `cancelled` once the abort propagates.
// Dispatch without awaiting because the fixture does not settle on its
// own. Waiting for the selected update pins it before cancellation and
// the cancelled prompt response in the transcript.
const promptDone = client.prompt({ sessionId, prompt: [{ type: 'text', text: step.text }] })
await waitForUpdate(u => u.sessionUpdate === 'agent_message_chunk')
const afterUpdate = step.afterUpdate ?? 'agent_message_chunk'
await waitForUpdate(u => u.sessionUpdate === afterUpdate)
await client.cancel({ sessionId })
await promptDone
return