Streams: tests for WritableStreamDefaultController.releaseBackpressure()#31742

Draft

MattiasBuelens wants to merge 8 commits intoweb-platform-tests:masterfrom MattiasBuelens:ws-release-backpressure

+164-6

Commits on Jan 13, 2022

Test whether releaseBackpressure() resolves ready promise
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Test whether pulling from transform's readable releases backpressure on its writable
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Test whether piping to writable with HWM = 0 works when using releaseBackpressure()
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Simplify
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Test whether releaseBackpressure() does nothing while there are queued chunks
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Use async/await
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Test whether piping through an identity transform with writable HWM = 0 works
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Test that draining the queue does not release backpressure
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