Mocking/Stubbing `super` calls

I would like to mock out super calls, especially constructors in some ES6 classes. For example

import Bar from 'bar';

class Foo extends Bar {
  constructor(opts) {
    ...
    super(opts);
  }

  someFunc() {
    super('asdf');
  }
}

And then in my test, I would like to do something like

import Foo from '../lib/foo';
import Bar from 'bar';

describe('constructor', function() {
  it('should call super', function() {
    let opts = Symbol('opts');
    let constructorStub = sinon.stub(Bar, 'constructor');
    new Foo(opts);
    sinon.assert.calledWith(constructorStub, opts);
  });
})

describe('someFunc', function() {
  it('should call super', function() {
    let funcStub = sinon.stub(Bar, 'someFunc');
    let foo = new Foo(opts);
    foo.someFunc();
    sinon.assert.calledWith(funcStub, 'asdf');
  });
})