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Reject strings in ReadableStream.from - #59594

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MattiasBuelens merged 1 commit into
web-platform-tests:masterfrom
MattiasBuelens:rs-from-reject-strings
Jul 13, 2026
Merged

Reject strings in ReadableStream.from#59594
MattiasBuelens merged 1 commit into
web-platform-tests:masterfrom
MattiasBuelens:rs-from-reject-strings

Reject strings in `ReadableStream.from`

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Community-TC Integration / wpt-chrome-dev-results-without-changes succeeded Jun 20, 2026 in 3m 28s

Community-TC (pull_request)

Collect results for all tests affected by a pull request in chrome but without the changes in the PR.

Details

View task in Taskcluster | View logs in Taskcluster | View task group in Taskcluster

Task Status

Started: 2026-06-20T20:46:08.906Z
Resolved: 2026-06-20T20:49:35.769Z
Task Execution Time: 3 minutes, 26 seconds, 863 milliseconds
Task Status: completed
Reason Resolved: completed
TaskId: R8K3h7rMRBO2Zsb5EKkSGA
RunId: 0

Artifacts

- public/logs/live_backing.log
- public/logs/live.log
- public/results/checkrun.md
- public/results/wpt_report.json.gz
- public/results/wpt_screenshot.txt.gz

WPT Command: python3 ./wpt run --channel=dev --no-fail-on-unexpected --log-wptreport=../artifacts/wpt_report.json --log-wptscreenshot=../artifacts/wpt_screenshot.txt --affected task_head --log-mach-level=info --log-mach=- -y --no-pause --no-restart-on-unexpected --install-fonts --verify-log-full --no-headless --enable-swiftshader --install-browser --install-webdriver chrome

[taskcluster 2026-06-20 20:46:09.027Z] Task ID: R8K3h7rMRBO2Zsb5EKkSGA
[taskcluster 2026-06-20 20:46:09.027Z] Worker ID: 7233327092498908470
[taskcluster 2026-06-20 20:46:09.027Z] Worker Group: us-central1-c
[taskcluster 2026-06-20 20:46:09.027Z] Worker Node Type: projects/757942385826/machineTypes/n2-standard-4
[taskcluster 2026-06-20 20:46:09.027Z] Worker Pool: proj-wpt/ci
[taskcluster 2026-06-20 20:46:09.027Z] Worker Version: 46.1.0
[taskcluster 2026-06-20 20:46:09.027Z] Public IP: 35.239.5.141
[taskcluster 2026-06-20 20:46:09.027Z] Hostname: proj-wpt-ci-ekg9ljy-t9ytidtyje8wkw

b1e71f63927a - Started downloading
b1e71f63927a - Downloaded in 0.031 seconds
66587c81b81a - Started downloading
5b82b858ea7e - Started downloading
08c7e224535e - Started downloading
66587c81b81a - Downloaded in 0.195 seconds
08c7e224535e - Downloaded in 0.06 seconds
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    at http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL ReadableStream.from accepts a ReadableStream - promise_test: Unhandled rejection with value: object "TypeError: ReadableStream.from is not a function"
Error
    at get_stack (http://web-platform.test:8000/resources/testharness.js:4802:21)
    at new AssertionError (http://web-platform.test:8000/resources/testharness.js:4795:22)
    at assert (http://web-platform.test:8000/resources/testharness.js:4779:19)
    at Test.<anonymous> (http://web-platform.test:8000/resources/testharness.js:764:29)
    at Test.step (http://web-platform.test:8000/resources/testharness.js:2869:25)
    at http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL ReadableStream.from accepts a ReadableStream async iterator - promise_test: Unhandled rejection with value: object "TypeError: ReadableStream.from is not a function"
Error
    at get_stack (http://web-platform.test:8000/resources/testharness.js:4802:21)
    at new AssertionError (http://web-platform.test:8000/resources/testharness.js:4795:22)
    at assert (http://web-platform.test:8000/resources/testharness.js:4779:19)
    at Test.<anonymous> (http://web-platform.test:8000/resources/testharness.js:764:29)
    at Test.step (http://web-platform.test:8000/resources/testharness.js:2869:25)
    at http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL ReadableStream.from re-throws errors from calling the @@iterator method - assert_throws_exactly: from() should re-throw the error function "() => ReadableStream.from(iterable)" threw object "TypeError: ReadableStream.from is not a function" but we expected it to throw object "Error: a unique string"
    at Test.<anonymous> (http://web-platform.test:8000/streams/readable-streams/from.any.js:201:3)
    at Test.step (http://web-platform.test:8000/resources/testharness.js:2869:25)
    at test (http://web-platform.test:8000/resources/testharness.js:633:30)
    at http://web-platform.test:8000/streams/readable-streams/from.any.js:193:1
  FAIL ReadableStream.from re-throws errors from calling the @@asyncIterator method - assert_throws_exactly: from() should re-throw the error function "() => ReadableStream.from(iterable)" threw object "TypeError: ReadableStream.from is not a function" but we expected it to throw object "Error: a unique string"
    at Test.<anonymous> (http://web-platform.test:8000/streams/readable-streams/from.any.js:212:3)
    at Test.step (http://web-platform.test:8000/resources/testharness.js:2869:25)
    at test (http://web-platform.test:8000/resources/testharness.js:633:30)
    at http://web-platform.test:8000/streams/readable-streams/from.any.js:204:1
  FAIL ReadableStream.from ignores @@iterator if @@asyncIterator exists - assert_throws_exactly: from() should re-throw the error function "() => ReadableStream.from(iterable)" threw object "TypeError: ReadableStream.from is not a function" but we expected it to throw object "Error: a unique string"
    at Test.<anonymous> (http://web-platform.test:8000/streams/readable-streams/from.any.js:224:3)
    at Test.step (http://web-platform.test:8000/resources/testharness.js:2869:25)
    at test (http://web-platform.test:8000/resources/testharness.js:633:30)
    at http://web-platform.test:8000/streams/readable-streams/from.any.js:215:1
  FAIL ReadableStream.from ignores a null @@asyncIterator - assert_throws_exactly: from() should re-throw the error function "() => ReadableStream.from(iterable)" threw object "TypeError: ReadableStream.from is not a function" but we expected it to throw object "Error: a unique string"
    at Test.<anonymous> (http://web-platform.test:8000/streams/readable-streams/from.any.js:236:3)
    at Test.step (http://web-platform.test:8000/resources/testharness.js:2869:25)
    at test (http://web-platform.test:8000/resources/testharness.js:633:30)
    at http://web-platform.test:8000/streams/readable-streams/from.any.js:227:1
  FAIL ReadableStream.from accepts an empty iterable - promise_test: Unhandled rejection with value: object "TypeError: ReadableStream.from is not a function"
Error
    at get_stack (http://web-platform.test:8000/resources/testharness.js:4802:21)
    at new AssertionError (http://web-platform.test:8000/resources/testharness.js:4795:22)
    at assert (http://web-platform.test:8000/resources/testharness.js:4779:19)
    at Test.<anonymous> (http://web-platform.test:8000/resources/testharness.js:764:29)
    at Test.step (http://web-platform.test:8000/resources/testharness.js:2869:25)
    at http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL ReadableStream.from: stream errors when next() rejects - promise_test: Unhandled rejection with value: object "TypeError: ReadableStream.from is not a function"
Error
    at get_stack (http://web-platform.test:8000/resources/testharness.js:4802:21)
    at new AssertionError (http://web-platform.test:8000/resources/testharness.js:4795:22)
    at assert (http://web-platform.test:8000/resources/testharness.js:4779:19)
    at Test.<anonymous> (http://web-platform.test:8000/resources/testharness.js:764:29)
    at Test.step (http://web-platform.test:8000/resources/testharness.js:2869:25)
    at http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL ReadableStream.from: stream errors when next() throws synchronously - promise_test: Unhandled rejection with value: object "TypeError: ReadableStream.from is not a function"
Error
    at get_stack (http://web-platform.test:8000/resources/testharness.js:4802:21)
    at new AssertionError (http://web-platform.test:8000/resources/testharness.js:4795:22)
    at assert (http://web-platform.test:8000/resources/testharness.js:4779:19)
    at Test.<anonymous> (http://web-platform.test:8000/resources/testharness.js:764:29)
    at Test.step (http://web-platform.test:8000/resources/testharness.js:2869:25)
    at http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL ReadableStream.from: stream errors when next() returns a non-object - promise_test: Unhandled rejection with value: object "TypeError: ReadableStream.from is not a function"
Error
    at get_stack (http://web-platform.test:8000/resources/testharness.js:4802:21)
    at new AssertionError (http://web-platform.test:8000/resources/testharness.js:4795:22)
    at assert (http://web-platform.test:8000/resources/testharness.js:4779:19)
    at Test.<anonymous> (http://web-platform.test:8000/resources/testharness.js:764:29)
    at Test.step (http://web-platform.test:8000/resources/testharness.js:2869:25)
    at http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL ReadableStream.from: stream errors when next() fulfills with a non-object - promise_test: Unhandled rejection with value: object "TypeError: ReadableStream.from is not a function"
Error
    at get_stack (http://web-platform.test:8000/resources/testharness.js:4802:21)
    at new AssertionError (http://web-platform.test:8000/resources/testharness.js:4795:22)
    at assert (http://web-platform.test:8000/resources/testharness.js:4779:19)
    at Test.<anonymous> (http://web-platform.test:8000/resources/testharness.js:764:29)
    at Test.step (http://web-platform.test:8000/resources/testharness.js:2869:25)
    at http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL ReadableStream.from: stream stalls when next() never settles - promise_test: Unhandled rejection with value: object "TypeError: ReadableStream.from is not a function"
Error
    at get_stack (http://web-platform.test:8000/resources/testharness.js:4802:21)
    at new AssertionError (http://web-platform.test:8000/resources/testharness.js:4795:22)
    at assert (http://web-platform.test:8000/resources/testharness.js:4779:19)
    at Test.<anonymous> (http://web-platform.test:8000/resources/testharness.js:764:29)
    at Test.step (http://web-platform.test:8000/resources/testharness.js:2869:25)
    at http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL ReadableStream.from: calls next() after first read() - promise_test: Unhandled rejection with value: object "TypeError: ReadableStream.from is not a function"
Error
    at get_stack (http://web-platform.test:8000/resources/testharness.js:4802:21)
    at new AssertionError (http://web-platform.test:8000/resources/testharness.js:4795:22)
    at assert (http://web-platform.test:8000/resources/testharness.js:4779:19)
    at Test.<anonymous> (http://web-platform.test:8000/resources/testharness.js:764:29)
    at Test.step (http://web-platform.test:8000/resources/testharness.js:2869:25)
    at http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL ReadableStream.from: cancelling the returned stream calls and awaits return() - promise_test: Unhandled rejection with value: object "TypeError: ReadableStream.from is not a function"
Error
    at get_stack (http://web-platform.test:8000/resources/testharness.js:4802:21)
    at new AssertionError (http://web-platform.test:8000/resources/testharness.js:4795:22)
    at assert (http://web-platform.test:8000/resources/testharness.js:4779:19)
    at Test.<anonymous> (http://web-platform.test:8000/resources/testharness.js:764:29)
    at Test.step (http://web-platform.test:8000/resources/testharness.js:2869:25)
    at http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL ReadableStream.from: return() is not called when iterator completes normally - promise_test: Unhandled rejection with value: object "TypeError: ReadableStream.from is not a function"
Error
    at get_stack (http://web-platform.test:8000/resources/testharness.js:4802:21)
    at new AssertionError (http://web-platform.test:8000/resources/testharness.js:4795:22)
    at assert (http://web-platform.test:8000/resources/testharness.js:4779:19)
    at Test.<anonymous> (http://web-platform.test:8000/resources/testharness.js:764:29)
    at Test.step (http://web-platform.test:8000/resources/testharness.js:2869:25)
    at http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL ReadableStream.from: cancel() resolves when return() method is missing - promise_test: Unhandled rejection with value: object "TypeError: ReadableStream.from is not a function"
Error
    at get_stack (http://web-platform.test:8000/resources/testharness.js:4802:21)
    at new AssertionError (http://web-platform.test:8000/resources/testharness.js:4795:22)
    at assert (http://web-platform.test:8000/resources/testharness.js:4779:19)
    at Test.<anonymous> (http://web-platform.test:8000/resources/testharness.js:764:29)
    at Test.step (http://web-platform.test:8000/resources/testharness.js:2869:25)
    at http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL ReadableStream.from: cancel() rejects when return() is not a method - promise_test: Unhandled rejection with value: object "TypeError: ReadableStream.from is not a function"
Error
    at get_stack (http://web-platform.test:8000/resources/testharness.js:4802:21)
    at new AssertionError (http://web-platform.test:8000/resources/testharness.js:4795:22)
    at assert (http://web-platform.test:8000/resources/testharness.js:4779:19)
    at Test.<anonymous> (http://web-platform.test:8000/resources/testharness.js:764:29)
    at Test.step (http://web-platform.test:8000/resources/testharness.js:2869:25)
    at http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL ReadableStream.from: cancel() rejects when return() rejects - promise_test: Unhandled rejection with value: object "TypeError: ReadableStream.from is not a function"
Error
    at get_stack (http://web-platform.test:8000/resources/testharness.js:4802:21)
    at new AssertionError (http://web-platform.test:8000/resources/testharness.js:4795:22)
    at assert (http://web-platform.test:8000/resources/testharness.js:4779:19)
    at Test.<anonymous> (http://web-platform.test:8000/resources/testharness.js:764:29)
    at Test.step (http://web-platform.test:8000/resources/testharness.js:2869:25)
    at http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL ReadableStream.from: cancel() rejects when return() throws synchronously - promise_test: Unhandled rejection with value: object "TypeError: ReadableStream.from is not a function"
Error
    at get_stack (http://web-platform.test:8000/resources/testharness.js:4802:21)
    at new AssertionError (http://web-platform.test:8000/resources/testharness.js:4795:22)
    at assert (http://web-platform.test:8000/resources/testharness.js:4779:19)
    at Test.<anonymous> (http://web-platform.test:8000/resources/testharness.js:764:29)
    at Test.step (http://web-platform.test:8000/resources/testharness.js:2869:25)
    at http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL ReadableStream.from: cancel() rejects when return() fulfills with a non-object - promise_test: Unhandled rejection with value: object "TypeError: ReadableStream.from is not a function"
Error
    at get_stack (http://web-platform.test:8000/resources/testharness.js:4802:21)
    at new AssertionError (http://web-platform.test:8000/resources/testharness.js:4795:22)
    at assert (http://web-platform.test:8000/resources/testharness.js:4779:19)
    at Test.<anonymous> (http://web-platform.test:8000/resources/testharness.js:764:29)
    at Test.step (http://web-platform.test:8000/resources/testharness.js:2869:25)
    at http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL ReadableStream.from: reader.read() inside next() - promise_test: Unhandled rejection with value: object "TypeError: ReadableStream.from is not a function"
Error
    at get_stack (http://web-platform.test:8000/resources/testharness.js:4802:21)
    at new AssertionError (http://web-platform.test:8000/resources/testharness.js:4795:22)
    at assert (http://web-platform.test:8000/resources/testharness.js:4779:19)
    at Test.<anonymous> (http://web-platform.test:8000/resources/testharness.js:764:29)
    at Test.step (http://web-platform.test:8000/resources/testharness.js:2869:25)
    at http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL ReadableStream.from: reader.cancel() inside next() - promise_test: Unhandled rejection with value: object "TypeError: ReadableStream.from is not a function"
Error
    at get_stack (http://web-platform.test:8000/resources/testharness.js:4802:21)
    at new AssertionError (http://web-platform.test:8000/resources/testharness.js:4795:22)
    at assert (http://web-platform.test:8000/resources/testharness.js:4779:19)
    at Test.<anonymous> (http://web-platform.test:8000/resources/testharness.js:764:29)
    at Test.step (http://web-platform.test:8000/resources/testharness.js:2869:25)
    at http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL ReadableStream.from: reader.cancel() inside return() - promise_test: Unhandled rejection with value: object "TypeError: ReadableStream.from is not a function"
Error
    at get_stack (http://web-platform.test:8000/resources/testharness.js:4802:21)
    at new AssertionError (http://web-platform.test:8000/resources/testharness.js:4795:22)
    at assert (http://web-platform.test:8000/resources/testharness.js:4779:19)
    at Test.<anonymous> (http://web-platform.test:8000/resources/testharness.js:764:29)
    at Test.step (http://web-platform.test:8000/resources/testharness.js:2869:25)
    at http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL ReadableStream.from(array), push() to array while reading - promise_test: Unhandled rejection with value: object "TypeError: ReadableStream.from is not a function"
Error
    at get_stack (http://web-platform.test:8000/resources/testharness.js:4802:21)
    at new AssertionError (http://web-platform.test:8000/resources/testharness.js:4795:22)
    at assert (http://web-platform.test:8000/resources/testharness.js:4779:19)
    at Test.<anonymous> (http://web-platform.test:8000/resources/testharness.js:764:29)
    at Test.step (http://web-platform.test:8000/resources/testharness.js:2869:25)
    at http://web-platform.test:8000/resources/testharness.js:2916:35
 0:55.65 INFO Got 4 unexpected results, with 0 unexpected passes
 0:55.65 wptserve INFO Stopped http server on 127.0.0.1:8000
 0:55.65 wptserve INFO Stopped http server on 127.0.0.1:8001
 0:55.66 wptserve INFO Stopped http server on 127.0.0.1:8003
 0:55.66 wptserve INFO Stopped http server on 127.0.0.1:8002
 0:55.66 wptserve INFO Stopped http server on 127.0.0.1:8444
 0:55.66 wptserve INFO Stopped http server on 127.0.0.1:8443
 0:55.66 wptserve INFO Stopped http server on 127.0.0.1:8445
 0:55.66 wptserve INFO Stopped http server on 127.0.0.1:8446
 0:55.66 wptserve INFO Stopped http server on 127.0.0.1:9000
 0:55.66 wptserve INFO Stopped WebTransport over HTTP/3 server on 127.0.0.1:11000
 0:55.73 wptserve INFO Close on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8888))
 0:55.73 wptserve INFO Close on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8889))
 0:55.84 INFO Removed font: Ahem.ttf
 0:55.86 INFO Closing logging queue
 0:55.86 INFO queue closed
 0:55.86 INFO Tolerating 4 unexpected results
[taskcluster 2026-06-20 20:49:34.049Z] === Task Finished ===
[taskcluster 2026-06-20 20:49:34.951Z] Successful task run with exit code: 0 completed in 205.927 seconds
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