Modal Button testing in ReactJS using Jest

Hello I am trying to write automation testing for my ReactJS project. my LoginModal.js is here

    var React =require('react');
    var ReactBootstrap= require('react-bootstrap/lib');
    var Modal= ReactBootstrap.Modal;
    var LoginModal= React.createClass({
      getInitialState: function() {
           return  {(
    showModal: false
    )}
},
    open() {
        this.setState({ showModal: true });
      },
    render: function(){
       return(
                <div>
                <Modal show={this.state.showModal} onHide={this.close} bsSize="small" aria-labelledby="contained-modal-title-sm" enforceFocus >
                {
                this.state.showModal ? 
                this.props.labelOn 
                :
                this.props.labelOff
                }
              <h1>Hello World</h1>
            </Modal>
                <button type="button" className="member_login btn btn-link"
              onClick={this.open}  id="login">
          Login <span className="caret"></span>
        </button>
                 </div>
            )
        }

    });

and my test file is following:

jest.unmock('../src/js/components/LoginModal');
var React =require('react');
var ReactDOM = require('react-dom');
var TestUtils= require('react-addons-test-utils');
var LoginModal= require('../src/js/components/LoginModal');
describe('LoginModal', () => {
it('open the modal after click', () => {
    const loginClick = TestUtils.renderIntoDocument(
      <LoginModal labelOn=true labelOff=false />
    );
const loginClickNode = ReactDOM.findDOMNode(loginClick);
expect(loginClickNode.textContent).toEqual(false);
TestUtils.Simulate.change(
      TestUtils.findRenderedDOMComponentWithTag(loginClick, 'Modal')
    );
    expect(loginClickNode.textContent).toEqual(true);
  });
});

I want to write unit testing for Login button but I didn't get any sample or example online.If anyone will help me then it will be great. after using npm testerror is showing at LoginModal module.

I am new to reactJs and I am not getting any tutorial on jest or another testing sample through goggle. Thanks