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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);