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test/parallel/test-net-client-bind-twice.js

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+'use strict';
+
+// This tests that net.connect() from a used local port throws EADDRINUSE.
+
+const common = require('../common');
+const assert = require('assert');
+const net = require('net');
+
+const server1 = net.createServer(common.mustNotCall());
+server1.listen(0, common.localhostIPv4, common.mustCall(() => {
+  const server2 = net.createServer(common.mustNotCall());
+  server2.listen(0, common.localhostIPv4, common.mustCall(() => {
+    const client = net.connect({
+      host: common.localhostIPv4,
+      port: server1.address().port,
+      localAddress: common.localhostIPv4,
+      localPort: server2.address().port
+    }, common.mustNotCall());
+
+    client.on('error', common.mustCall((err) => {
+      assert.strictEqual(err.code, 'EADDRINUSE');
+      server1.close();
+      server2.close();
+    }));
+  }));
+}));