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test/js/node/test/parallel/test-http2-session-unref.js

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+'use strict';
+// Tests that calling unref() on Http2Session:
+// (1) Prevents it from keeping the process alive
+// (2) Doesn't crash
+
+const common = require('../common');
+if (!common.hasCrypto)
+  common.skip('missing crypto');
+const http2 = require('http2');
+const Countdown = require('../common/countdown');
+const { duplexPair } = require('stream');
+
+const server = http2.createServer();
+const [ clientSide, serverSide ] = duplexPair();
+
+const counter = new Countdown(3, () => server.unref());
+
+// 'session' event should be emitted 3 times:
+// - the vanilla clientgit 
+// - the destroyed client
+// - manual 'connection' event emission with generic Duplex stream
+server.on('session', common.mustCallAtLeast((session) => {
+  counter.dec();
+  session.unref();
+}, 3));
+
+server.listen(0, common.mustCall(() => {
+  const port = server.address().port;
+
+  // unref new client
+  {
+    const client = http2.connect(`http://localhost:${port}`);
+    client.unref();
+  }
+
+  // Unref destroyed client
+  {
+    const client = http2.connect(`http://localhost:${port}`);
+
+    client.on('connect', common.mustCall(() => {
+      client.destroy();
+      client.unref();
+    }));
+  }
+
+  // Unref destroyed client
+  {
+    const client = http2.connect(`http://localhost:${port}`, {
+      createConnection: common.mustCall(() => clientSide)
+    });
+
+    client.on('connect', common.mustCall(() => {
+      client.destroy();
+      client.unref();
+    }));
+  }
+}));
+server.emit('connection', serverSide);