Quarantine ServerVirtualizationTest.QuickGrid_AnchorMode_Top_AppendKeepsViewportStable

[github-actions]

Failing Test(s)

Microsoft.AspNetCore.Components.E2ETest.ServerExecutionTests.ServerVirtualizationTest.QuickGrid_AnchorMode_Top_AppendKeepsViewportStable

Failure Frequency

Failed 2 times over the past 30 days.

Error Message

System.Exception : Scroll assertion failed: expected QuickGrid should start at the top, but scrollTop=54778, scrollHeight=55078, clientHeight=300, maxScrollTop=54778
---- OpenQA.Selenium.BrowserAssertFailedException : Xunit.Sdk.TrueException: Assert.True() Failure
Expected: True
Actual:   False

Stacktrace

Details

at Microsoft.AspNetCore.Components.E2ETest.Tests.VirtualizationTest.AssertScrollTop(IJavaScriptExecutor js, IWebElement container, Func`2 condition, String expectation) in /[REDACTED].cs:line 2921
at Microsoft.AspNetCore.Components.E2ETest.Tests.VirtualizationTest.QuickGrid_AnchorMode_Top_AppendKeepsViewportStable(String anchorMode, Boolean useItemsProvider) in /[REDACTED].cs:line 2102
at InvokeStub_VirtualizationTest.QuickGrid_AnchorMode_Top_AppendKeepsViewportStable(Object, Span`1)

Logs

Details

Logs were not available from the Helix work item for these failures.

Build

https://dev.azure.com/dnceng-public/public/_build/results?buildId=1518788

Warning

Firewall blocked 1 domain

The following domain was blocked by the firewall during workflow execution:

• awmgmcpg

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
    - defaults
    - "awmgmcpg"

See Network Configuration for more information.

Generated by Daily Test Quarantine Management · 558.6 AIC · ⌖ 6.78 AIC · ⊞ 1.8K · ◷

[github-actions]

Investigation: QuickGrid_AnchorMode_Top_AppendKeepsViewportStable Flakiness

The test QuickGrid_AnchorMode_Top_AppendKeepsViewportStable fails with a scroll position assertion:

Scroll assertion failed: expected QuickGrid should start at the top, but scrollTop=54778

The test verifies that when appending items to a QuickGrid with AnchorMode=Top, the viewport stays at the top. The failure shows scrollTop=54778, meaning the grid is scrolled nearly to the bottom before the test even begins the mutation step.

Root cause: This is a timing/flakiness issue in the E2E test setup. The test mounts the QuickGrid component and immediately checks the scroll position assuming it starts at the top, but the browser may not have completed layout at that point. The test was newly introduced in #67783 and has shown intermittent failures in 2 subsequent CI builds against unrelated PRs, confirming flakiness rather than a consistent regression. Quarantine to unblock CI while the test's scroll-position pre-conditions are investigated.

Warning

Firewall blocked 1 domain

The following domain was blocked by the firewall during workflow execution:

• awmgmcpg

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
    - defaults
    - "awmgmcpg"

See Network Configuration for more information.

Generated by Daily Test Quarantine Management · 558.6 AIC · ⌖ 6.78 AIC · ⊞ 1.8K · ◷