gistfile1.js

class User extends React.Component {
    render() {
        return (
            <a href="#" ref="goHome" onClick={this.goHome}>
                Go Home
            </a>
        );
    }
    goHome() {
        this.context.router.transitionTo('home');
    }
}

User.contextTypes = { router: React.PropTypes.object };

let transitionTo = sinon.stub();
let user = testTree(<User />, {
    context: {
        router: {
            transitionTo: transitionTo
        }
    }
});

user.goHome.click();
expect(transitionTo).to.be.calledWith('dashboard');

Isn't line 26 meant to read: expect(transitionTo).to.be.calledWith('home'); ?