React testing

test.js

/*
Call a component method
https://github.com/airbnb/enzyme/issues/208#issuecomment-187313486
*/

const wrapper = shallow(<Button />); wrapper.instance().handleClick();

/*
Re-render component after calling setState
https://github.com/airbnb/enzyme/issues/450#issuecomment-225075145
*/

expect(wrapper.update().find('#counter').text()).to.equal('1');

/*
Pass props to event handler
https://github.com/airbnb/enzyme/issues/400
*/

wrapper.find('Select').simulate('change', { target: { value: 'text' }});