test(ext/dns): Test for dns resolving

tests/unit/dns_test.ts

@@ -0,0 +1,24 @@
+// Copyright 2018-2025 the Deno authors. MIT license.
+
+import { resolve4, resolve6 } from "node:dns/promises";
+import { assertEquals } from "@std/assert/equals";
+
+Deno.test({
+  name: "Dns resolving for ttl values, A and AAAA records",
+  async fn() {
+    const ARecord = "34.120.54.55";
+    const AAAARecord = "2600:1901::6d85::";
+
+    const ARes1 = await Deno.resolveDns("deno.com", "A", { ttl: true });
+    const ARes2 = await resolve4("deno.com", { ttl: true });
+
+    assertEquals(ARes1[0].data, ARecord);
+    assertEquals(ARes2[0].address, ARecord);
+
+    const AAAARes1 = await Deno.resolveDns("deno.com", "AAAA", { ttl: true });
+    const AAAARes2 = await resolve6("deno.com", { ttl: true });
+
+    assertEquals(AAAARes1[0].data, AAAARecord);
+    assertEquals(AAAARes2[0].address, AAAARecord);
+  },
+});