Bug 315119 – REGRESSION(313199@main?): [iOS]: 2 tests in TestWebKitAPI.WKAttachmentTestsIOS are flaky failures

• Status: NEW
• Component: New Bugs

[Marta Darbinyan]

Observing failing tests in API-Tests-iOS-Simulator-EWS test runs. 

Failed tests:
TestWebKitAPI.WKAttachmentTestsIOS.InsertPastedFilesAsAttachments
TestWebKitAPI.WKAttachmentTestsIOS.InsertPastedContactAsAttachment


Error:
07:07:48.517 3617     TestWebKitAPI.WKAttachmentTestsIOS.InsertPastedFilesAsAttachments
07:07:48.517 3617         2026-05-19 06:35:04.992 com.apple.WebKit.GPU[34546:1015257] CoreText note: Client requested name ".SFUI-Regular_wdth_opsz110000_GRAD_wght", it will get TimesNewRomanPSMT rather than the intended font. All system UI font access should be through proper APIs such as CTFontCreateUIFontForLanguage() or +[UIFont systemFontOfSize:].
07:07:48.517 3617         2026-05-19 06:35:04.992 com.apple.WebKit.GPU[34546:1015257] CoreText note: Set a breakpoint on CTFontLogSystemFontNameRequest to debug.
07:07:48.517 3617         2026-05-19 06:35:05.172 TestWebKitAPI[34536:1015152] Encountered error: Error Domain=WKErrorDomain Code=4 "A JavaScript exception occurred" UserInfo={WKJavaScriptExceptionLineNumber=1, WKJavaScriptExceptionMessage=TypeError: null is not an object (evaluating 'document.querySelector('attachment[type^=application]').getAttribute'), WKJavaScriptExceptionColumnNumber=56, WKJavaScriptExceptionSourceURL=file:///Volumes/Data/worker/API-Tests-iOS-Simulator-EWS/build/WebKitBuild/Release-iphonesimulator/TestWebKitAPIResources.bundle/, NSLocalizedDescription=A JavaScript exception occurred} while evaluating script: document.querySelector('attachment[type^=application]').getAttribute('title')
07:07:48.517 3617         2026-05-19 06:35:05.173 TestWebKitAPI[34536:1015152] Expected data: <10820 bytes> but observed: <38 bytes> for <_WKAttachment 0x60000210fe80 id='09edcb2c-6663-46f1-ad78-aba9cdcc3833'>
07:07:48.517 3617         2026-05-19 06:35:05.173 TestWebKitAPI[34536:1015152] Observed error: (null) while reading data for <_WKAttachment 0x60000210fe80 id='09edcb2c-6663-46f1-ad78-aba9cdcc3833'>
07:07:48.517 3617         2026-05-19 06:35:05.173 TestWebKitAPI[34536:1015152] Expected data: <10 bytes> but observed: <38 bytes> for <_WKAttachment 0x60000210fe80 id='09edcb2c-6663-46f1-ad78-aba9cdcc3833'>
07:07:48.517 3617         2026-05-19 06:35:05.173 TestWebKitAPI[34536:1015152] Observed error: (null) while reading data for <_WKAttachment 0x60000210fe80 id='09edcb2c-6663-46f1-ad78-aba9cdcc3833'>
07:07:48.517 3617         
07:07:48.517 3617         /Volumes/Data/worker/iOS-26-Simulator-Build-EWS/build/Tools/TestWebKitAPI/Tests/WebKit/WKWebView/WKAttachmentTests.mm:2642
07:07:48.517 3617         Expected equality of these values:
07:07:48.517 3617           2U
07:07:48.517 3617             Which is: 2
07:07:48.517 3617           observer.observer().inserted.count
07:07:48.517 3617             Which is: 1


Test history:
https://results.webkit.org/?suite=api-tests&suite=api-tests&test=TestWebKitAPI.WKAttachmentTestsIOS.InsertPastedFilesAsAttachments&test=TestWebKitAPI.WKAttachmentTestsIOS.InsertPastedContactAsAttachment&platform=ios

Test results:
https://ews-build.webkit.org/#/builders/13/builds/137965

[Radar WebKit Bug Importer]

<rdar://problem/177462776>

[EWS]

Test gardening commit 313518@main (4bbb48218481): <https://commits.webkit.org/313518@main>

Reviewed commits have been landed. Closing PR #65213 and removing active labels.