"use strict";

function mandatory(paramName) {
  throw new Error(`Missing parameter: ${paramName}`);
}

async function foo({ a, b = mandatory("b") } = {}) {
  return Promise.resolve(b);
}

return (async () => {
  assert.doesNotThrow(() => {
    foo()
      .then(() => {
        throw new Error('should not occcur');
      })
      .catch(() => true);
  });
})();