firefox-main/testing/web-platform/tests/webtransport/congestion-control.https.any.js (file symbol)

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// META: global=window,worker
// META: script=resources/webtransport-test-helpers.sub.js
// META: script=/common/utils.js
// Tests that a WebTransport session can be established when congestionControl
// is specified in the constructor, and that the attribute is readable.
const CONGESTION_CONTROL_VALUES = ["default", "throughput", "low-latency"];
for (const value of CONGESTION_CONTROL_VALUES) {
promise_test(async t => {
const id = token();
const wt = new WebTransport(
webtransport_url(`client-close.py?token=${id}`),
{congestionControl: value});
await wt.ready;
// The congestionControl attribute should be readable after connection.
// The spec says if the UA doesn't support the requested algorithm, it
// falls back to "default". So the value is either what was requested or
// "default".
assert_in_array(wt.congestionControl, [value, "default"],
'congestionControl should be the requested value or "default"');
wt.close();
}, `WebTransport session established with congestionControl "${value}" and attribute is readable`);
}
promise_test(async t => {
const id = token();
const wt = new WebTransport(
webtransport_url(`client-close.py?token=${id}`));
await wt.ready;
// When no congestionControl is specified, the default should be used.
assert_equals(wt.congestionControl, "default",
'congestionControl should default to "default"');
wt.close();
}, 'WebTransport session without congestionControl option defaults to "default"');