Test custom async hooks

I use Enzyme version 3.8.0.

```
// functional component
const UsersList = ({ onItemSelected, }) => {
// async service fetch hooks
const url = 'service-url';
const { error, loading, data, } = useService(Service, url, {
amount: 0,
});

return (

My useService make an async call to get user list data.

**Test :**

```
jest.mock('axios');
it('Should Mount Component & Display Data', async () => {
// mock result
axiosMock.get.mockResolvedValue(UserListMock);

// mount component
const wrapper = mount();

// wait to have data
await expect(wrapper.state().data).to.not.be.null;

// test
expect(wrapper.find('h2').first().text()).toEqual('Mock Title');
});
```

**But I have this error :**
`ReactWrapper::state() can only be called on class components`