[Testing] Fix for flaky UITests (PlatformDragEventArgs & Issue8870) in CI that occasionally fails

[anandhan-rajagopal]

This pull request includes updates to test cases to improve reliability and performance in the DragAndDropUITests and Issue8870 tests. The changes address flakiness in drag-and-drop operations and optimize delays during orientation changes.

Build Link: https://dev.azure.com/xamarin/public/_build/results?buildId=144524&view=ms.vss-test-web.build-test-results-tab&runId=4381475&resultId=100039&paneView=attachments

Test Cases

• src/Controls/tests/TestCases.Shared.Tests/Tests/DragAndDropUITests.cs: Added an additional drag-and-drop operation in the PlatformDragEventArgs test to mitigate flakiness observed in CI environments.

• src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue8870.cs: Replaced Task.Delay with Thread.Sleep and reduced the delay duration from 3000ms to 1000ms in the RotatingCollectionViewWithHTMLShouldNotHangOrCrash test to improve execution speed.

[dotnet-policy-service]

Hey there @@anandhan-rajagopal! Thank you so much for your PR! Someone from the team will get assigned to your PR shortly and we'll get it reviewed.

[Copilot]

Pull Request Overview

This PR fixes flaky UITests by adjusting the delay durations and replacing asynchronous delays with synchronous sleeps for improved reliability and performance.

• In Issue8870 tests, the delay duration is reduced from 3000ms to 1000ms and asynchronous delays (Task.Delay) are replaced with Thread.Sleep.
• In DragAndDropUITests, an additional drag-and-drop operation is added to mitigate CI flakiness.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue8870.cs	Reduced delays and changed async method to synchronous method.
src/Controls/tests/TestCases.Shared.Tests/Tests/DragAndDropUITests.cs	Added a duplicate drag-and-drop step to reduce flakiness.

Comments suppressed due to low confidence (1)

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue8870.cs:23

• [nitpick] Changing the test signature from async Task to void removes the asynchronous exception handling normally provided by the testing framework. Please confirm that the test runner properly captures exceptions with this synchronous approach.

		public void RotatingCollectionViewWithHTMLShouldNotHangOrCrash()

[jsuarezruiz]

/azp run MAUI-UITests-public

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).