Update store with Apollo mutation when testing with MockedProvider

I'm trying to test component that should be updated with new data after running a mutation. I posted example code below. You can find it on GitHub as runnable repository as well.

Unfortunately, I didn't find a way to actually update the store data for the MockedProvider after the mutation. When you run the test you can see that the mutation is being executed and the component gets rendered after that. But since the mutation is not doing anything the new todo item is not added.

Can anyone tell me how to change data with a mutation when using MockedProvider?

The test query and mutation:

const TODOS_QUERY = gql`
  query todos {
    todos {
      title
    }
  }
`

const ADD_TODO_MUTATION = gql`
  mutation addTodo($title: String!) {
    addTodo(title: $title)
  }
`;

The test component:

const Component = () => (
  <Query query={TODOS_QUERY}>
    {
      ({ data }) => {
        console.log('render'); return (
        <Mutation mutation={ADD_TODO_MUTATION}>
          {
            addTodo => (
              <div>
                <button onClick={() => { console.log('addTodo'); addTodo({ variables: { title: 'My new todo' } }) }}>
                  Click me to add a todo!
                </button>

                {
                  (data.todos || []).map(({ title }, index) => (
                    <div key={index} className="todo-item">
                      {title}
                    </div>
                  ))
                }
              </div>
            )
          }
        </Mutation>
      )}
    }
  </Query>
);

The test implementation. This mounts the component using Enzyme, simulates a click on the button to execute the mutation and waits until the component is rendered again.

it('renders without crashing', async () => {
  const mocks = [
    {
      request: {
        query: TODOS_QUERY,
      },
      result: {
        data: {
          todos: [
            {
              title: 'An old todo',
            },
          ],
        },
      },
    },
    {
      request: {
        query: ADD_TODO_MUTATION,
        variables: {
          title: 'My new todo',
        },
      },
      result: {
        data: {
          addTodo: null,
        },
      },
    },
  ];

  const wrapper = mount(
    <MockedProvider mocks={mocks} addTypename={false}>
      <Component />
    </MockedProvider>
  );

  await wait(100);
  wrapper.update();

  console.log(wrapper.debug())

  expect(wrapper.contains('An old todo')).toBe(true);
  expect(wrapper.contains('My new todo')).toBe(false);
  wrapper.find('button').simulate('click');

  await wait(100);
  wrapper.update();

  console.log(wrapper.debug())

  expect(wrapper.contains('An old todo')).toBe(true);
  expect(wrapper.contains('My new todo')).toBe(true);
});

Thanks a lot for your help!