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Improve AnchorMode_End_LargeAppendAtBottom_StillFollows #67639

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f22369c
Fix auto-follow E2E test logic.
ilonatommy Jul 7, 2026
e6a2def
Correct a typo
ilonatommy Jul 8, 2026
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15 changes: 13 additions & 2 deletions src/Components/test/E2ETest/Tests/VirtualizationTest.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -2906,12 +2906,23 @@ public void AnchorMode_End_LargeAppendAtBottom_StillFollows(bool variableHeight,

Browser.True(() =>
{
js.ExecuteScript("arguments[0].scrollTop = arguments[0].scrollHeight", container);
var st = (long)js.ExecuteScript("return arguments[0].scrollTop", container);
var sh = (long)js.ExecuteScript("return arguments[0].scrollHeight", container);
var ch = (long)js.ExecuteScript("return arguments[0].clientHeight", container);
return sh - st - ch < 2;
}, TimeSpan.FromSeconds(30), "End mode: large append should still follow to bottom");
}, TimeSpan.FromSeconds(30), "End mode: large append should auto-follow to the new bottom without manual scrolling");

// The rows at the new bottom must materialize as real items (not async placeholders)
Browser.True(() =>
{
var maxIndex = (long)js.ExecuteScript(
"var els = arguments[0].querySelectorAll('.item[data-index]');" +
" var m = -1; for (var i = 0; i < els.length; i++) {" +
" var v = parseInt(els[i].getAttribute('data-index'), 10); if (v > m) { m = v; } } return m;",
container);
return maxIndex >= 1099;
}, TimeSpan.FromSeconds(30),
"End mode: real rows near the end of the list (index ~1099) should be visible at the bottom, not placeholders");
}

[Fact]
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