Jyotisha/frontend/tests/chat-stream-layout.test.ts

import assert from "node:assert/strict";
import { readFileSync } from "node:fs";
import test from "node:test";

import { chatMessageViews } from "../src/lib/chat-message-view.ts";

const pageSource = readFileSync(new URL("../src/app/page.tsx", import.meta.url), "utf8");
const globalStyles = readFileSync(new URL("../src/app/globals.css", import.meta.url), "utf8");
const messageRowSource = readFileSync(new URL("../src/components/chat-message-row.tsx", import.meta.url), "utf8");
const activitySource = readFileSync(new URL("../src/components/agent-activity-status.tsx", import.meta.url), "utf8");

const previousMessages = [
  { role: "user", text: "问题" },
] as const;

test("keeps the assistant render identity stable when streaming settles", () => {
  // Given: one assistant answer exists first as a transient stream.
  const streaming = chatMessageViews(previousMessages, true, "完整答案");

  // When: the same answer becomes part of the persisted transcript.
  const settled = chatMessageViews([
    ...previousMessages,
    { role: "assistant", text: "完整答案" },
  ], false, "");

  // Then: React receives the same key and can reuse the existing message shell.
  assert.equal(streaming.at(-1)?.renderKey, settled.at(-1)?.renderKey);
  assert.equal(streaming.at(-1)?.state, "streaming");
  assert.equal(settled.at(-1)?.state, "settled");
});

test("does not duplicate a completed assistant answer while loading state settles", () => {
  // Given: the final answer has entered the transcript while request cleanup lags.
  const completedMessages = [
    ...previousMessages,
    { role: "assistant", text: "完整答案" },
  ] as const;

  // When: the render view is derived with the old loading flag still true.
  const views = chatMessageViews(completedMessages, true, "完整答案");

  // Then: only the persisted answer is rendered.
  assert.equal(views.length, completedMessages.length);
  assert.equal(views.at(-1)?.state, "settled");
});

test("shows honest agent activity states before and during streamed text", () => {
  const activity = { phase: "chart-calculation", label: "正在计算本命盘…" } as const;
  const view = chatMessageViews(previousMessages, true, "", activity).at(-1);
  assert.deepEqual(view?.activity, activity);
  assert.match(messageRowSource, /"loading-method": "searching"/);
  assert.match(messageRowSource, /"chart-calculation": "solving"/);
  assert.match(messageRowSource, /"evidence-validation": "working"/);
  assert.match(messageRowSource, /"answer-composition": "composing"/);
  assert.match(messageRowSource, /message\.activity\?\.label/);
  assert.doesNotMatch(messageRowSource, /正在核对星盘信息/);
  assert.match(messageRowSource, /正在处理…/);
  assert.match(messageRowSource, /showActivity = message\.state !== "settled"/);
  assert.match(messageRowSource, /\{showActivity && \(/);
  assert.match(messageRowSource, /message\.text && <ChatMessageContent text=\{message\.text\}/);
  assert.match(activitySource, /<ThinkingOrb aria-hidden="true" state=\{state\} size=\{20\}/);
  assert.match(activitySource, /className="agent-activity-status__text"/);
  assert.match(globalStyles, /@keyframes agent-activity-shimmer/);
  assert.match(globalStyles, /agent-activity-status-in 160ms ease-out/);
  assert.match(globalStyles, /@media \(prefers-reduced-motion: reduce\)[\s\S]*\.agent-activity-status__text[\s\S]*animation: none/);
  assert.doesNotMatch(activitySource, /CircleCheck|回答已完成|completed/);
  assert.doesNotMatch(messageRowSource, /: "completed"/);
  assert.doesNotMatch(globalStyles, /\.thinking\b/);
  assert.match(pageSource, /application\/x-ndjson/);
  assert.match(pageSource, /createNdjsonParser/);
  assert.match(pageSource, /if \(event\.type === "run\.failed"\) throw new ConsultationResponseError/);
  assert.match(pageSource, /if \(!runCompleted\) throw new ConsultationResponseError/);
  assert.match(pageSource, /agentExecutionReceipt = event\.receipt/);
});

test("nothing sits between the transcript and the composer to shift height while streaming", () => {
  // The follow-up chip row used to appear and disappear here, changing composer height
  // mid-stream; the jump-to-latest overlay is the only remaining sibling and it is
  // absolutely positioned, so it cannot reflow the composer.
  const composerWrap = pageSource.slice(
    pageSource.indexOf('composer-wrap ${starterHomeVisible'),
    pageSource.indexOf("<ChatComposer"));

  assert.doesNotMatch(composerWrap, /composer-suggestions/);
  assert.match(composerWrap, /pointer-events-none absolute inset-x-0 bottom-full/);
});

test("docks the composer inside the chat panel instead of floating over content", () => {
  assert.match(pageSource, /<div className=\{`composer-wrap \$\{starterHomeVisible \? "composer-wrap-starter" : ""\}`\}>/);
  assert.match(globalStyles, /\.chat-panel[^}]*grid-template-rows:\s*68px minmax\(0,\s*1fr\) auto/);
  assert.match(globalStyles, /\.conversation[^}]*padding-bottom:\s*var\(--composer-reserve\)/);
  assert.match(globalStyles, /\.composer-wrap[^}]*position:\s*sticky/);
  assert.match(globalStyles, /\.composer-wrap[^}]*bottom:\s*0/);
  assert.doesNotMatch(globalStyles, /\.composer-wrap[^}]*position:\s*fixed/);
});