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test(markdown): require growth while holding a streaming paragraph

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This commit is contained in:
Mohamed Boudra
2026-10-15 18:35:05 +02:00
parent 4dfd7c18a0
commit 1f12ee95a1
2 changed files with 13 additions and 1 deletions
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packages/app/e2e/browser/agent-timeline-scroll-smoothness.spec.ts
+4
View File
@@ -156,6 +156,10 @@ test("reserves image space before its response arrives", async ({ page }, testIn
test("holds a paragraph still while a mixed response streams and completes", async ({ page }) => {
await withStreamingReader(async (agent) => {
const reading = await holdParagraphThroughCompletion(page, agent);
expect(
reading.textGrowth,
"the held reader must observe an actively growing response",
).toBeGreaterThan(1000);
expect(
reading.maxFollowGap,
"follow-bottom must catch each streamed commit before the next frame",
packages/app/e2e/support/helpers/timeline-scroll-smoothness.ts
+9 -1
View File
@@ -100,11 +100,16 @@ export async function holdParagraphThroughCompletion(page: Page, agent: MockAgen
const paragraph = page.getByRole("heading", { name: "Long section 3", exact: true });
await paragraph.waitFor({ state: "attached" });
const recording = await paragraph.evaluateHandle((heading) => {
if (!document.querySelector('[data-testid="turn-working-indicator"]')) {
throw new Error("The stream completed before the reader detached");
}
const viewport = document.querySelector<HTMLElement>('[data-testid="agent-chat-scroll"]')!;
const clip = viewport.getBoundingClientRect();
viewport.scrollTop += heading.getBoundingClientRect().y - (clip.top + clip.height / 2);
const baseline = heading.getBoundingClientRect().y;
const result = { maxDrift: 0, retained: true, done: false };
const initialTextLength = heading.closest('[data-testid="assistant-message"]')!.textContent!
.length;
const result = { maxDrift: 0, retained: true, textGrowth: 0, done: false };
let stableAt = performance.now();
let signature = "";
const frame = (now: number) => {
@@ -112,6 +117,9 @@ export async function holdParagraphThroughCompletion(page: Page, agent: MockAgen
const current = [...document.querySelectorAll("h2")].find(
(n) => n.textContent === "Long section 3",
);
const textLength =
current?.closest('[data-testid="assistant-message"]')?.textContent?.length ?? 0;
result.textGrowth = Math.max(result.textGrowth, textLength - initialTextLength);
if (current)
result.maxDrift = Math.max(
result.maxDrift,