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test/parallel/test-net-server-unref-persistent.js

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+'use strict';
+const common = require('../common');
+const net = require('net');
+const server = net.createServer();
+
+// Unref before listening
+server.unref();
+server.listen();
+
+// If the timeout fires, that means the server held the event loop open
+// and the unref() was not persistent. Close the server and fail the test.
+setTimeout(common.mustNotCall(), 1000).unref();