node/test/parallel/test-diagnostics-channel-tracing-channel-promise-early-exit.js

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'use strict';
const common = require('../common');
const dc = require('diagnostics_channel');
const channel = dc.tracingChannel('test');
const handlers = {
start: common.mustNotCall(),
end: common.mustNotCall(),
asyncStart: common.mustNotCall(),
asyncEnd: common.mustNotCall(),
error: common.mustNotCall()
};
// While subscribe occurs _before_ the promise resolves,
// no async events should be published.
channel.tracePromise(() => {
return new Promise(setImmediate);
}, {});
channel.subscribe(handlers);