[Webkit-unassigned] [Bug 223558] New: Streams: new test failure for canceling the branches of an errored tee'd stream

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=223558

            Bug ID: 223558
           Summary: Streams: new test failure for canceling the branches
                    of an errored tee'd stream
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mattias.buelens at gmail.com

The WPT test "ReadableStream teeing: erroring a teed stream should properly handle canceled branches" was improved in https://github.com/web-platform-tests/wpt/pull/28153. The test now checks that the cancel promises of the two branches are rejected with the correct reason.

This updated test fails in Safari, see: https://wpt.fyi/results/streams/readable-streams/tee.any.html?diff&filter=ADC&run_id=5700976721788928&run_id=5767793259577344
Chrome, Edge and Firefox still pass the updated test.

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