deepseek-harness/apps/web/tests/steering.e2e.ts

// Web e2e scenario: mid-turn steering, end to end. The composer locks while a
// turn runs, so the product UI has no steering gesture yet — the steer is
// POSTed from the page itself over the same same-origin /api transport the
// client uses (TODO(web-steer-composer): drive this through a composer
// gesture once one exists). Everything downstream is product: the gateway
// routes mode:'steer' to Agent.steer, the loop drains it at the step
// boundary into a durable steering/message event, the SSE mux pushes it, and
// the transcript renders the badged interjection bubble. The question
// composer supplies the deterministic mid-turn window: while ask_user_question
// blocks, the turn is provably running, so record and replay perform the
// identical steer-then-answer sequence with zero timing dependence — and the
// recorded final reply proves the steer reached the MODEL (it obeys an
// instruction that only the steering message carries).
import { readFile } from 'node:fs/promises'
import { fileURLToPath } from 'node:url'
import { join } from 'node:path'
import type { Browser, Page } from 'playwright'
import { chromium } from 'playwright'
import { afterAll, beforeAll, describe, expect, it, onTestFailed } from 'vitest'
import { parseSessionLog } from '@deepseek-ai/dsh-llm-replay'
import type { SessionEvent } from '@deepseek-ai/dsh-session'
import {
  assertFixtureInventory, fixtureUserPrompts, launchWebScaffold, recordFixture,
  watchConsole, webSnapshotMode, type WebScaffold,
} from './scaffold.ts'
import { saveFailureShot } from './support.ts'

const SNAPSHOT_DIR = fileURLToPath(new URL('./snapshots/steering', import.meta.url))
const FIXTURE = join(SNAPSHOT_DIR, 'session.jsonl')
const MODE = webSnapshotMode()

const PROMPT = 'Use the ask_user_question tool to ask me exactly one question with id "checkpoint", question "Ready to continue?", header "Checkpoint", and options labeled "Yes" and "No". After I answer, reply with one short sentence acknowledging my answer and stop.'
const STEER = 'Interjection: include the word BANANA in your final reply.'

/** Concatenated assistant text deltas — the model-visible reply body. */
function assistantText(events: SessionEvent[]): string {
  return events
    .filter(e => e.type === 'assistant/chunk')
    .map((e) => {
      const chunk = (e as SessionEvent & { data: { chunk: { type: string; text?: string } } }).data.chunk
      return chunk.type === 'text-delta' ? chunk.text ?? '' : ''
    })
    .join('')
}

describe('web e2e: mid-turn steering lands durably and visibly', () => {
  let scaffold: WebScaffold
  let browser: Browser
  let page: Page
  let tripwire: ReturnType<typeof watchConsole>
  let liveSessionId: string | undefined
  const sessionEvents: SessionEvent[] = []

  beforeAll(async () => {
    scaffold = await launchWebScaffold(MODE === 'record' ? {} : { replayFixture: FIXTURE, paceMs: 15 })
    scaffold.ctx.on('session/event', (session, event) => {
      liveSessionId ??= session.id
      sessionEvents.push(event)
    })
    browser = await chromium.launch()
    page = await browser.newPage({ viewport: { width: 1680, height: 1000 } })
    tripwire = watchConsole(page)
    await page.goto(scaffold.baseUrl, { waitUntil: 'load' })
    await page.waitForSelector('[class*="frame"]', { timeout: 30_000 })
  }, 120_000)

  afterAll(async () => {
    await browser?.close()
    await scaffold?.close()
  })

  it('steers during the blocked step; the interjection is logged, rendered, and obeyed', async () => {
    onTestFailed(() => saveFailureShot(page, 'web-e2e-steering'))
    if (MODE !== 'record') {
      // The steer must NOT be a user/message — it lands as steering/message.
      expect(fixtureUserPrompts(await readFile(FIXTURE, 'utf8'))).toEqual([PROMPT])
    }
    const input = page.locator('textarea').first()
    await input.waitFor({ timeout: 10_000 })
    const settled = scaffold.whenTurnSettled(MODE === 'record' ? 180_000 : 30_000)
    await input.fill(PROMPT)
    await input.press('Enter')

    // The blocked composer is the mid-turn barrier: its presence proves the
    // ask_user_question step is executing, i.e. the turn is running NOW.
    const composer = page.locator('[data-question-key]')
    await composer.waitFor({ timeout: MODE === 'record' ? 120_000 : 30_000 })

    // Steer through the real wire from the page (same envelope + endpoint the
    // web client's session.prompt uses). accepted:true is the transport proof.
    expect(liveSessionId).toBeDefined()
    const reply = await page.evaluate(async ({ sessionId, text }) => {
      const response = await fetch('/api/session.prompt', {
        method: 'POST',
        headers: { 'content-type': 'application/json' },
        body: JSON.stringify({
          type: 'client-request',
          rpcId: crypto.randomUUID(),
          method: 'session.prompt',
          payload: { sessionId, mode: 'steer', content: [{ type: 'text', text }] },
        }),
      })
      return await response.json() as { result?: { ok?: boolean } }
    }, { sessionId: liveSessionId!, text: STEER })
    expect(reply.result?.ok).toBe(true)

    // Answer the composer; the tool result closes the step, the loop drains
    // the steer as steering/message, and the steered continuation runs the
    // final model call.
    await composer.getByRole('radio', { name: 'Yes' }).click()
    await composer.getByRole('radio', { name: 'Yes' }).press('Enter')
    await settled

    if (MODE === 'record') {
      const sessionId = await settled
      await recordFixture(scaffold, sessionId, FIXTURE)
      // Fixture honesty: a recording where the live model ignored the steer
      // would replay as a vacuous scenario — reject it and re-record instead.
      const recorded = parseSessionLog(await readFile(FIXTURE, 'utf8'))
      expect(recorded.filter(e => e.type === 'steering/message')).toHaveLength(1)
      expect(assistantText(recorded)).toContain('BANANA')
      return
    }

    // Durable: exactly one steering/message, inside turn 1, carrying the text.
    const steerEvents = sessionEvents.filter(e => e.type === 'steering/message')
    expect(steerEvents).toHaveLength(1)
    expect((steerEvents[0] as SessionEvent & { data: { turn: number } }).data.turn).toBe(1)
    expect(JSON.stringify(steerEvents[0])).toContain('BANANA')
    const turnEnds = sessionEvents.filter(e => e.type === 'turn/end')
    expect(turnEnds).toHaveLength(1)
    expect((turnEnds[0] as SessionEvent & { data: { reason: { kind: string } } }).data.reason.kind).toBe('completed')

    // Visible: the badged interjection bubble plus the reply that obeys it
    // (steer text + final reply each contain the marker word).
    await expect.poll(() => page.getByText('插话').count(), { timeout: 15_000 }).toBe(1)
    await expect.poll(() => page.getByText('Interjection:', { exact: false }).count(), { timeout: 10_000 }).toBe(1)
    await expect.poll(() => page.getByText('BANANA', { exact: false }).count(), { timeout: 10_000 }).toBeGreaterThanOrEqual(2)
    expect(await page.locator('[data-question-key]').count()).toBe(0)
    expect(tripwire.pageErrors).toEqual([])
  }, 200_000)

  it.skipIf(MODE === 'record')('keeps the fixture inventory closed', async () => {
    await assertFixtureInventory(SNAPSHOT_DIR, ['session.jsonl'])
  })
})