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test/parallel/test-messageport-hasref.js

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+'use strict';
+const common = require('../common');
+
+const { MessageChannel } = require('worker_threads');
+const { createHook } = require('async_hooks');
+const { strictEqual } = require('assert');
+
+const handles = [];
+
+createHook({
+  init(asyncId, type, triggerAsyncId, resource) {
+    if (type === 'MESSAGEPORT') {
+      handles.push(resource);
+    }
+  }
+}).enable();
+
+const { port1, port2 } = new MessageChannel();
+strictEqual(handles[0], port1);
+strictEqual(handles[1], port2);
+
+strictEqual(handles[0].hasRef(), false);
+strictEqual(handles[1].hasRef(), false);
+
+port1.unref();
+strictEqual(handles[0].hasRef(), false);
+
+port1.ref();
+strictEqual(handles[0].hasRef(), true);
+
+port1.unref();
+strictEqual(handles[0].hasRef(), false);
+
+port1.on('message', () => {});
+strictEqual(handles[0].hasRef(), true);
+
+port2.unref();
+strictEqual(handles[1].hasRef(), false);
+
+port2.ref();
+strictEqual(handles[1].hasRef(), true);
+
+port2.unref();
+strictEqual(handles[1].hasRef(), false);
+
+port2.on('message', () => {});
+strictEqual(handles[0].hasRef(), true);
+
+port1.on('close', common.mustCall(() => {
+  strictEqual(handles[0].hasRef(), false);
+  strictEqual(handles[1].hasRef(), false);
+}));
+
+port2.close();
+
+strictEqual(handles[0].hasRef(), true);
+strictEqual(handles[1].hasRef(), true);