* ---------> [foo-xml] ---> [xercesImpl] ---> [xmlParserAPIs]
* </pre>
*/
public void testSimpleWalk()
{
DependencyGraph graph = new DependencyGraph( "org.foo", "foo-util", "1.0" );
String rootKey = DependencyGraphKeys.toKey( graph.getRootNode().getArtifact() );
addEdgeAndNodes( graph, toEdge( rootKey, "org.foo:foo-common:1.0::jar" ) );
addEdgeAndNodes( graph, toEdge( rootKey, "org.foo:foo-xml:1.0::jar" ) );
addEdgeAndNodes( graph, toEdge( "org.foo:foo-xml:1.0::jar", "xerces:xercesImpl:2.2.1::jar" ) );
addEdgeAndNodes( graph, toEdge( "xerces:xercesImpl:2.2.1::jar", "xerces:xmlParserAPIs:2.2.1::jar" ) );