[Gecko Bug 1750634] Add WPT Test for Stream Object globals #32649
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This test is based on the general structure of
js/src/tests/non262/ReadableStream/readable-stream-globals.js, however the
expectations have been commented and updated to match what we believe is
the correct WebIDL behaviour.
Not all the features of that test case have been ported over, as there's
some stuff around the handling of Symbol.species that we can test elsewhere,
and it attempts to test BYOB streams, which we have yet to implement.
Note: I tried to initially write this as an xpcshell test case using
Cu.sandbox; but I found that I wasn't geting global behaviour that matched
my expectations from testing on the web.
Differential Revision: https://phabricator.services.mozilla.com/D137492
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1750634
gecko-commit: 00d4eefcf59bda521a129e82b4fdca832cb3a6b1
gecko-reviewers: smaug, saschanaz