enzyme fin() code example

Example: enzyme find selector

const wrapper = shallow(<MyComponent />);
expect(wrapper.find('.foo')).to.have.lengthOf(1);
expect(wrapper.find('.bar')).to.have.lengthOf(3);

// compound selector
expect(wrapper.find('div.some-class')).to.have.lengthOf(3);

// CSS id selector
expect(wrapper.find('#foo')).to.have.lengthOf(1);