export const createUser = values => {
  const email = values.get("user_attributes[email]");
  const password = values.get("user_attributes[password]");
  return dispatch => {
    dispatch({
      [RSAA]: {
        endpoint: `${globalVar.API_URL}/users/`,
        method: "POST",
        body: values,
        types: [
          CREATE_USER,
          {
            type: CREATE_USER_SUCCESS,
            payload: (action, state, response) => {
              return response.json().then(json => {
                dispatch(login(email, password));
                dispatch(sendFlashMessage("success", json.message));
                return json;
              });
            }
          },
          CREATE_USER_FAILURE
        ]
      }
    });
  };
};

class UserNew extends Component {
  constructor(props) {
    super(props);
    this.onSubmit = this.onSubmit.bind(this);
  }

  onSubmit(values) {
    values = { user_attributes: values };
    const data = objectToFormData(values);
    this.props.actions.createUser(data);
  }

  render() {
    const { handleSubmit, errors } = this.props;
    return (
      <UserForm
        handleSubmit={handleSubmit}
        onSubmit={this.onSubmit}
        errors={errors}
      />
    );
  }
}

it("create new user", done => {
  wrapper
    .find("#sign-up")
    .hostNodes()
    .simulate("click");

  wrapper
    .find('[name="first_name"]')
    .hostNodes()
    .simulate("change", { target: { value: "User" } });

 ...

wrapper
  .find("form")
  .hostNodes()
  .simulate("submit");