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Add support for platform specific communication channels #2497

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Add support for platform specific communication channels#2497
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package:test
@natebosch

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@natebosch
natebosch
opened on May 13, 2025

Some test platforms want to expose new runtime capabilities that coordinate between the code under test and the test platform. We currently implement a similar capability baked in to the test runner instead of individual platforms - spawnHybridCode and spawnHybridUri.

test/pkgs/test_core/lib/src/runner/runner_test.dart

Lines 73 to 79 in b9c59ea

case 'spawn-hybrid-uri':
// When we kill the isolate that the test lives in, that will close
// this virtual channel and cause the spawned isolate to close as
// well.
spawnHybridUri(msg['url'] as String, msg['message'], suite).pipe(
testChannel.virtualChannel((msg['channel'] as num).toInt()));
break;

We can likely use the existing multichannel mechanism to create additional communication channels.

test/pkgs/test_api/lib/src/scaffolding/spawn_hybrid.dart

Lines 155 to 170 in b9c59ea

var channel = Zone.current[#test.runner.test_channel] as MultiChannel?;
if (channel == null) {
throw UnsupportedError("Can't connect to the test runner.\n"
'spawnHybridUri() is currently only supported within "dart test".');
}
ensureJsonEncodable(message);
var virtualChannel = channel.virtualChannel();
StreamChannel isolateChannel = virtualChannel;
channel.sink.add({
'type': 'spawn-hybrid-uri',
'url': uri,
'message': message,
'channel': virtualChannel.id
});

We will need to solve the API on the platform definition side as well.

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