deepseek-harness/packages/client/runtime/tests/history-fold.spec.ts

import { createMessage } from '@deepseek-ai/dsh-llm'
import type { SessionEvent } from '@deepseek-ai/dsh-session/types'
import { describe, expect, it } from 'vitest'
import { projectConversationHistory } from '../src/client/session-history/history-fold.ts'
import { ev } from './event-script.ts'

const at = (seq: number, event: Record<string, unknown>): SessionEvent =>
  ({ seq, time: 1_700_000_000_000 + seq, ...event }) as unknown as SessionEvent

describe('projectConversationHistory', () => {
  it('projects frozen surface generations without widening the core live surface', () => {
    const events = [
      ev.user(0, 'a'),
      ev.user(1, 'b'),
      at(2, {
        type: 'assistant/message',
        surfaceOp: { op: 'replace', start: 0, end: 0 },
        sourceEventSeqs: [0],
        data: {
          turn: 1,
          step: 1,
          message: createMessage({
            role: 'assistant',
            content: [{ type: 'text', text: 'summary' }],
            source: { kind: 'model', provider: 'fake', model: 'fake' },
          }),
        },
      }),
      at(3, {
        type: 'assistant/message',
        surfaceOp: { op: 'replace', start: 2, end: 1 },
        sourceEventSeqs: [2, 1],
        data: {
          turn: 1,
          step: 2,
          message: createMessage({
            role: 'assistant',
            content: [{ type: 'text', text: 'summary 2' }],
            source: { kind: 'model', provider: 'fake', model: 'fake' },
          }),
        },
      }),
    ]

    expect(projectConversationHistory(events.map(event => ({ event }))).contexts.map(context => ({
      id: context.id,
      parentId: context.parentId,
      originSeq: context.originSeq,
      nodes: context.nodes.map(node => node.seq),
    }))).toEqual([
      { id: 0, parentId: undefined, originSeq: undefined, nodes: [0, 1] },
      { id: 1, parentId: 0, originSeq: 2, nodes: [2, 1] },
      { id: 2, parentId: 1, originSeq: 3, nodes: [3] },
    ])
  })

  it('projects assistant timing and the active request header from history', () => {
    const projection = projectConversationHistory([
      ev.stepStart(0, 1, 2),
      at(1, { type: 'request/header', data: {
        reason: 'initial',
        header: {
          config: { provider: 'fake', model: 'first' },
          tools: [],
        },
      } }),
      ev.chunkStart(2, 1, 2),
      ev.chunkText(3, 1, 'token', 2),
      ev.assistant(4, 1, 'done', 2),
      ev.stepStart(5, 2, 1),
      ev.chunkText(6, 2, 'next', 1),
      ev.assistant(7, 2, 'next done', 1),
    ].map(event => ({ event })))

    expect(projection.eventNodes[0]).toMatchObject({
      kind: 'assistant',
      timing: {
        stepStartTime: 1_700_000_000_000,
        firstTokenTime: 1_700_000_000_003,
        completedTime: 1_700_000_000_004,
      },
      requestConfig: { provider: 'fake', model: 'first' },
    })

    expect(projection.eventNodes.at(-1)).toMatchObject({
      timing: {
        stepStartTime: 1_700_000_000_005,
        firstTokenTime: 1_700_000_000_006,
        completedTime: 1_700_000_000_007,
      },
      requestConfig: { provider: 'fake', model: 'first' },
    })
  })
})