re-enable a test (denoland#4461)

std/examples/tests/curl_test.ts

@@ -6,12 +6,9 @@ import { randomPort } from "../../http/test_util.ts";
 const port = randomPort();
 Deno.test({
   name: "[examples/curl] send a request to a specified url",
-  // FIXME(bartlomieju): this test is leaking both resources and ops,
-  // and causes interference with other tests
-  ignore: true,
   fn: async () => {
     const server = serve({ port });
-    (async (): Promise<void> => {
+    const serverPromise = (async (): Promise<void> => {
       for await (const req of server) {
         req.respond({ body: "Hello world" });
       }
@@ -36,8 +33,9 @@ Deno.test({
 
       assertStrictEq(actual, expected);
     } finally {
-      process.close();
       server.close();
+      process.close();
+      await serverPromise;
     }
   }
 });