mi1.js

'use strict';

function getAsyncTests () {
  return new Promise((resolve, reject) => {
    setTimeout(resolve, 1);
  });
}

(async () => {
  let tests = await getAsyncTests();

  describe('Async Mocha', function () {
    describe('Will it grep1?', function () {
      it('it grepped1!', function () {
      });
    });
  });
  run();
})();

mi2.js

'use strict';

function getAsyncTests () {
  return new Promise((resolve, reject) => {
    setTimeout(resolve, 1);
  });
}

(async () => {
  let tests = await getAsyncTests();

  describe('Async Mocha', function () {
    describe('Will it grep2?', function () {
      it('it grepped2!', function () {
      });
    });
  });
  run();
})();

mi3.js

'use strict';

describe('Sync Mocha', function () {
  describe('Will it grep3?', function () {
    it('it grepped3!', function () {
    });
  });
});