gistfile1.js

let testTree = require('react-test-tree');

class Bar extends React.Component {
    render() {
        return (
            <div className="Bar">
                <span className="Bar-name" ref="name">
                    {this.props.name}
                </span>
            </div>
        );
    }
}

class Foo extends React.Component {
    render() {
        return (
            <div className="Foo" refCollection="bars">
                {this.props.bars.map(bar => <Bar name={bar.name} />)}
            </div>
        );
    }
}
let bars = [{ name: "foo" }, { name: "bar" }, { name: "baz"}];
let foo = testTree(<Foo bars={bars} />);

expect(foo.bars[1].name.innerText).to.eql("bar");