example_test.ts

import { test, assertEqual } from "https://deno.land/x/testing/mod.ts";

test(function t1() {
  assertEqual("hello", "hello");
});

test(function t2() {
  assertEqual("world", "world");
});

hello_world.ts

import { serve } from "https://deno.land/x/std@v0.2.10/http/server.ts";
const s = serve("0.0.0.0:8000");

async function main() {
  for await (const req of s) {
    console.log("req = ", req)
    req.respond({ body: new TextEncoder().encode("Hello World\n") });
  }
}

main();