opencode/packages/simulation/test/recording.test.ts

import { expect, test } from "bun:test"
import { mkdtemp, rm } from "node:fs/promises"
import { tmpdir } from "node:os"
import { join } from "node:path"
import { SimulationRenderer } from "../src/frontend/renderer"
import { Timeline, type Event } from "../src/recording"

test("streams ANSI chunks into a versioned JSONL timeline", async () => {
  const directory = await mkdtemp(join(tmpdir(), "simulation-recording-"))
  const path = join(directory, "nested", "timeline.jsonl")

  try {
    const timeline = await Timeline.create(path, 80, 24)
    await new Promise<void>((resolve, reject) => {
      timeline.write(Buffer.from("\u001b[2Jhello"), (error) => (error ? reject(error) : resolve()))
    })
    expect(await timeline.finish()).toBe(path)
    await new Promise<void>((resolve) => timeline.write(Buffer.from("ignored"), () => resolve()))

    const events = (await Bun.file(path).text())
      .trim()
      .split("\n")
      .map((line) => JSON.parse(line) as Event)
    expect(events[0]).toEqual({ type: "header", version: 1, cols: 80, rows: 24, encoding: "base64" })
    expect(events[1]?.type).toBe("output")
    if (events[1]?.type !== "output") throw new Error("Missing output event")
    expect(Buffer.from(events[1].data, "base64").toString()).toBe("\u001b[2Jhello")
    expect(events[1].at_ms).toBeGreaterThanOrEqual(0)
    expect(events.at(-1)).toMatchObject({ type: "output", data: "" })
  } finally {
    await rm(directory, { recursive: true, force: true })
  }
})

test("captures native renderer output and finishes on destroy", async () => {
  const directory = await mkdtemp(join(tmpdir(), "simulation-renderer-recording-"))
  const path = join(directory, "timeline.jsonl")
  const renderer = await SimulationRenderer.create({}, path)

  try {
    await SimulationRenderer.setupFor(renderer)?.renderOnce()
    renderer.destroy()
    expect(await SimulationRenderer.finish(renderer)).toBe(path)

    const events = (await Bun.file(path).text())
      .trim()
      .split("\n")
      .map((line) => JSON.parse(line) as Event)
    expect(events.some((event) => event.type === "output")).toBe(true)
  } finally {
    if (!renderer.isDestroyed) renderer.destroy()
    await SimulationRenderer.finish(renderer)
    await rm(directory, { recursive: true, force: true })
  }
})