React Bootstrap Test Fiddle

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.8.24/browser.js"></script>
<script src="https://fb.me/react-with-addons-0.14.2.js"></script>
<script src="https://fb.me/react-dom-0.14.2.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-bootstrap/0.27.3/react-bootstrap.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jasmine/2.3.4/jasmine.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jasmine/2.3.4/jasmine-html.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jasmine/2.3.4/boot.min.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/jasmine/2.3.4/jasmine.css">
<script src="https://facebook.github.io/react/js/jsfiddle-integration-babel.js"></script>

<div id="container">
    <!-- This element's contents will be replaced with your component. -->
</div>

JavaScript 1.7

describe('Dialog', function() {
	var TestUtils = React.addons.TestUtils;
	var node;
	
	beforeEach(function() {
		node = document.createElement('div');
		document.body.appendChild(node);
	});

	afterEach(function() {		
		ReactDOM.unmountComponentAtNode(node);
		document.body.removeChild(node);
	});
	
	it('Should have title component', function() {
		var noOp = function() {};
		
		var instance = ReactDOM.render(
			<ReactBootstrap.Modal show onHide={noOp} animation={false}>
				<ReactBootstrap.Modal.Header>
            	<ReactBootstrap.Modal.Title>Test Dialog Title</ReactBootstrap.Modal.Title>
          		</ReactBootstrap.Modal.Header>
			</ReactBootstrap.Modal>,
			node);
		
        // This test fails. Find DOM Node.
		var instanceDomNode = ReactDOM.findDOMNode(instance);
		expect(instanceDomNode).not.toBe(null);
							
  		// This test passes. Find Modal component.                          
		var component = TestUtils.findRenderedComponentWithType(instance, ReactBootstrap.Modal);
		expect(component).not.toBe(null);
        
		// Error: Did not find exactly one match for componentType:function ModalHeader()...
		//var headerComponent = TestUtils.findRenderedComponentWithType(component, ReactBootstrap.Modal.Header);
		//expect(headerComponent).not.toBe(null);
		
        //This test fails. Find modal header.
		var headerComponents = TestUtils.scryRenderedComponentsWithType(component, ReactBootstrap.Modal.Header);
		expect(headerComponents.length).not.toBe(0);
	});
});