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FileAPI: handle host endianness in Blob constructor TypedArray tests - #63714

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jdm merged 1 commit into
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abhayagarwal-dev:fix-blob-typedarrays-endianness
Oct 15, 2026
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FileAPI: handle host endianness in Blob constructor TypedArray tests#63714
jdm merged 1 commit into
web-platform-tests:masterfrom
abhayagarwal-dev:fix-blob-typedarrays-endianness

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@abhayagarwal-dev abhayagarwal-dev commented Oct 15, 2026 •
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TypedArrays store data using host-native byte order.
On big-endian architectures (e.g. s390x / ppc64 AIX), TypedArray byte sequences read as a Blob produce different byte orders than on little-endian architectures.

This PR dynamically asserts the expected string based on host endianness so the tests pass across all platforms.

Before (in Big-Endian machine):

    [UNEXPECTED_FAILURE][FAIL] Passing typed arrays as elements of the blobParts array should work.
    assert_equals: expected "PASSPASSPASSPASSPASSPASSPASS" but got "PASSPASSAPSSAPSSSSAPSSAPSSAP"
        at Test.<anonymous> (/home/iojs/build/workspace/node-test-commit-aix/nodes/aix72-ppc64/test/fixtures/wpt/FileAPI/support/Blob.js:16:5)
        at process.processTicksAndRejections (node:internal/process/task_queues:105:5)
    Command: /home/iojs/build/workspace/node-test-commit-aix/nodes/aix72-ppc64/out/Release/node  /home/iojs/build/workspace/node-test-commit-aix/nodes/aix72-ppc64/test/wpt/test-blob.js 'Blob-constructor.any.js'
    

    
    [UNEXPECTED_FAILURE][FAIL] Passing a Float64Array as element of the blobParts array should work.
    assert_equals: expected "PASSPASS" but got "SSAPSSAP"
        at Test.<anonymous> (/home/iojs/build/workspace/node-test-commit-aix/nodes/aix72-ppc64/test/fixtures/wpt/FileAPI/support/Blob.js:16:5)
        at process.processTicksAndRejections (node:internal/process/task_queues:105:5)
    Command: /home/iojs/build/workspace/node-test-commit-aix/nodes/aix72-ppc64/out/Release/node  /home/iojs/build/workspace/node-test-commit-aix/nodes/aix72-ppc64/test/wpt/test-blob.js 'Blob-constructor.any.js'

    Files: 2/2 ran, 0 passed, 0 skipped, 0 expected failures, 2 unexpected failures, 0 unexpected passes
Subtests: 138 passed, 0 skipped, 0 expected failures, 8 unexpected failures, 0 unexpected passes

After(In Big-Endian machine):

Files: 2/2 ran, 2 passed, 0 skipped, 0 expected failures, 0 unexpected failures, 0 unexpected passes
Subtests: 146 passed, 0 skipped, 0 expected failures, 0 unexpected failures, 0 unexpected passes

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@jdm
jdm enabled auto-merge (rebase) October 15, 2026 13:59
auto-merge was automatically disabled October 15, 2026 14:18

Pull request was closed

@abhayagarwal-dev
abhayagarwal-dev requested a review from jdm October 15, 2026 14:22
@jdm
jdm enabled auto-merge (rebase) October 15, 2026 14:23
@jdm
jdm merged commit 5878c7a into web-platform-tests:master Oct 15, 2026
37 of 38 checks passed
@abhayagarwal-dev abhayagarwal-dev mentioned this pull request Oct 15, 2026
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