[Webkit-unassigned] [Bug 196905] New: API test WKAttachmentTests.AddAttachmentToConnectedImageElement is a flaky failure on Mac Release builds

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=196905

            Bug ID: 196905
           Summary: API test
                    WKAttachmentTests.AddAttachmentToConnectedImageElement
                    is a flaky failure on Mac Release builds
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Macintosh
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aestes at apple.com

On macOS Mojave, in a Release build of r244241, the API test WKAttachmentTests.AddAttachmentToConnectedImageElement failed on 6 out of 10 runs of the WKAttachmentTests API test suite. It also sometimes fails on api-mac EWS bots in a way that makes it appear like a seemingly-unrelated patch regressed the test (e.g., bug #177484).

Steps to reproduce:
1. Create a Mac Release build of r244241.
2. run-api-tests WKAttachmentTests.

Expected results:
All 31 tests pass.

Actual results:
On 6 out of 10 runs, WKAttachmentTests.AddAttachmentToConnectedImageElement failed.

    TestWebKitAPI.WKAttachmentTests.AddAttachmentToConnectedImageElement
        _RegisterApplication(), FAILED TO establish the default connection to the WindowServer, _CGSDefaultConnection() is NULL.
        2019-04-14 08:23:20.508 TestWebKitAPI[59497:767481] Expected inserted attachments: (
        ) to match (
            "<_WKAttachment 0x7fbcc7d01340 id='2414efeb-bbf1-4650-83ce-a167b0a11484'>"
        ).

        /Volumes/Data/Projects/OpenSource/Tools/TestWebKitAPI/Tests/WebKitCocoa/WKAttachmentTests.mm:150
        Value of: insertedAttachmentsMatch
          Actual: false
        Expected: true

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