createStubbedContextComponent.js

var React = require('react');
var assign = require('object-assign');

function createStubbedContextComponent(BaseComponent, context) {
  var _contextTypes = {}, _context = context;

  Object.keys(_context).forEach(function(key) {
    _contextTypes[key] = React.PropTypes.any;
  });

  if(BaseComponent.contextTypes) {
    assign(BaseComponent.contextTypes, _contextTypes);
  } else {
    assign(BaseComponent, { contextTypes: _contextTypes });
  }

  var StubbedContextComponent = React.createClass({
    childContextTypes: _contextTypes,
    getChildContext() { return _context; },
    render() { return <BaseComponent {...this.state} {...this.props} />; }
  });

  return StubbedContextComponent;
}

module.exports = createStubbedContextComponent;

index.js

var React = require('react');
var createStubbedContextComponent = require('./createStubbedContextComponent');

var TestComponent = React.createClass({
  render() { return <h1>{this.props.bar} {this.context.foo}</h1>; }
})

var StubbedComponent = createStubbedContextComponent(TestComponent, { foo: 'bar' })

require('domready')(function() {
  React.render(
    <StubbedComponent bar="foo" />,
    document.getElementById('app')
  );
})