Async unit tests with mocha

mocha.ts

import assert = require("assert");

describe("Async Tests", function() {
  it("uses callback", function(done) {
    console.log("Starting test...");
    setTimeout(()=>{
      assert.ok("Timeout complete");
      console.log("Test complete");
      done();
    }, 1000);
  });
  it("uses promise", function() {
    console.log("Starting test...");
    return new Promise((resolve) => {
      setTimeout(()=>{
        assert.ok("Timeout complete");
        console.log("Test complete");
        resolve(true);
      }, 1000);
    });
  });
  it("uses async func", async function() {
    await new Promise((resolve) => {
      setTimeout(()=>{
        resolve(true);
      }, 1000);
    });
    assert.ok("Timeout complete");
    console.log("Test complete");
  });
  it("fails if 'done(return_val)' isn't called.", function(done) {
    console.log("Starting test...");
    return new Promise((resolve) => {
      setTimeout(()=>{
        assert.ok("Timeout complete");
        console.log("Test complete");
        resolve(true);
      }, 1000);
    });
  });
});