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test/parallel/test-dns-channel-cancel-promise.js

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+'use strict';
+const common = require('../common');
+const { promises: dnsPromises } = require('dns');
+const assert = require('assert');
+const dgram = require('dgram');
+
+const server = dgram.createSocket('udp4');
+const resolver = new dnsPromises.Resolver();
+
+server.bind(0, common.mustCall(async () => {
+  resolver.setServers([`127.0.0.1:${server.address().port}`]);
+
+  // Single promise
+  {
+    server.once('message', () => {
+      resolver.cancel();
+    });
+
+    const hostname = 'example0.org';
+
+    await assert.rejects(
+      resolver.resolve4(hostname),
+      {
+        code: 'ECANCELLED',
+        syscall: 'queryA',
+        hostname
+      }
+    );
+  }
+
+  // Multiple promises
+  {
+    server.once('message', () => {
+      resolver.cancel();
+    });
+
+    const assertions = [];
+    const assertionCount = 10;
+
+    for (let i = 1; i <= assertionCount; i++) {
+      const hostname = `example${i}.org`;
+
+      assertions.push(
+        assert.rejects(
+          resolver.resolve4(hostname),
+          {
+            code: 'ECANCELLED',
+            syscall: 'queryA',
+            hostname: hostname
+          }
+        )
+      );
+    }
+
+    await Promise.all(assertions);
+  }
+
+  server.close();
+}));