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test(desktop): deflake mid-scroll older-history spinner smoke test #1632

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Merged
wesbillman merged 1 commit into from
Jul 8, 2026
+16 −6
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test(desktop): deflake mid-scroll older-history spinner smoke test #1632

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22 changes: 16 additions & 6 deletions desktop/tests/e2e/scroll-history.spec.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -1577,16 +1577,26 @@ test("older-history spinner stays visible in viewport while fetching mid-scroll"
const timeline = page.getByTestId("message-timeline");
await expect(timeline.locator("[data-message-id]").first()).toBeVisible();

await timeline.hover();
await page.mouse.wheel(0, -1_500);
await page.waitForTimeout(100);
await page.mouse.wheel(0, 1_000);
await page.waitForTimeout(100);
await page.mouse.wheel(0, -1_000);
// Trigger the older fetch near the top, then move the reader mid-scroll
// while the fetch is still in flight. Set scrollTop directly instead of
// mouse.wheel: wheel deltas vary across CI environments and can land the
// timeline at scrollTop 0, which is the one position this test must avoid.
await timeline.evaluate((element) => {
const timelineElement = element as HTMLDivElement;
timelineElement.scrollTop = 150;
timelineElement.dispatchEvent(new Event("scroll", { bubbles: true }));
});

const indicator = page.getByTestId("message-timeline-fetching-older");
await expect(indicator).toBeVisible({ timeout: 2_000 });

await timeline.evaluate((element) => {
const timelineElement = element as HTMLDivElement;
timelineElement.scrollTop = timelineElement.clientHeight;
timelineElement.dispatchEvent(new Event("scroll", { bubbles: true }));
});
await expect(indicator).toBeVisible();

const { scrollTop } = await getTimelineMetrics(page);
expect(scrollTop).toBeGreaterThan(8);

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