I have the following test...

it("basic test", () => {
  stub = sinon.stub(app.mongoose, "connectMongoose").returns(Promise.resolve());
  expect(val.listen.callCount).to.equal(0);
  expect(stub.callCount).to.equal(0);
  app.start();
  expect(stub.callCount).to.equal(1);
  expect(val.listen.callCount).to.equal(1);
  stub.restore();
});
it("Error", () => {
  stub = sinon.stub(app.mongoose, "connectMongoose").returns(Promise.reject(new Error("error")));
  expect(val.listen.callCount).to.equal(0);
  expect(stub.callCount).to.equal(0);
  app.start();
  expect(stub.callCount).to.equal(1);
  expect(val.listen.callCount).to.equal(1);
  stub.restore();
});

But when I run I get

TypeError: Attempted to wrap connectMongoose which is already wrapped

I also tried app.mongoose.connectMongoose.restore() but same result. I also tried sandboxes although those seem deprecated.

How do I restore so I can mock it again?