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test/parallel/test-dgram-bind-error-repeat.js

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+'use strict';
+const common = require('../common');
+const dgram = require('dgram');
+
+// Regression test for https://github.com/nodejs/node/issues/30209
+// No warning should be emitted when re-trying `.bind()` on UDP sockets
+// repeatedly.
+
+process.on('warning', common.mustNotCall());
+
+const reservePortSocket = dgram.createSocket('udp4');
+reservePortSocket.bind(() => {
+  const { port } = reservePortSocket.address();
+
+  const newSocket = dgram.createSocket('udp4');
+
+  let errors = 0;
+  newSocket.on('error', common.mustCall(() => {
+    if (++errors < 20) {
+      newSocket.bind(port, common.mustNotCall());
+    } else {
+      newSocket.close();
+      reservePortSocket.close();
+    }
+  }, 20));
+  newSocket.bind(port, common.mustNotCall());
+});