Client xhr transport test

[aran]

Depends on #747 .

The added commit is 05eea0d .

This updates client_xhr_transport_test to avoid dart:html, performing some ceremony to work around the unavailability of the previous mock strategy.

[github-actions]

PR Health

Breaking changes ⚠️

Package	Change	Current Version	New Version	Needed Version	Looking good?
grpc	Non-Breaking	4.0.1	4.0.2-wip	4.1.0 Got "4.0.2-wip" expected >= "4.1.0" (non-breaking changes)	⚠️

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Package	Changed Files

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Coverage ⚠️

File	Coverage
lib/grpc_or_grpcweb.dart	💚 57 %
lib/src/client/transport/xhr_transport.dart	💔 Not covered

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API leaks ⚠️

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grpc	Any $1.Duration

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[aran]

RFC. There's quite a lot of boilerplate to work around the extension type extern for XMLHttpRequest. More work may be needed here to reimplement some of XMLHttpRequest for the test's expectations, if using this approach.

Help needed: the tests don't pass. I'm not sure how they're supposed to be run, since I run dart test -p chrome I still see errors about the unavailability of dart:js_interop, which is surprising, so something is broken in my mental model.

[aran]

@Moseum - anyone on maintainer side who could help shepherd this?

[mosuem]

I think we need to land #747 first, which has some failures at the moment. Happy to see this go through in general, thanks a lot for the initiative!

[aran]

@mosuem - should I temporarily remove this test from #747? I see that there is a CI failure in #747 that is related to this test.

[mosuem]

Help needed: the tests don't pass. I'm not sure how they're supposed to be run, since I run dart test -p chrome I still see errors about the unavailability of dart:js_interop, which is surprising, so something is broken in my mental model.

I see different failures locally - TypeError: null: type 'JSNull' is not a subtype of type 'JSObject'

[mosuem]

@mosuem - should I temporarily remove this test from #747? I see that there is a CI failure in #747 that is related to this test.

I would suggest to close #747 in favor of this PR, to fix the tests in the same PR as the other changes.