/**
  * @covers Navinator\Collection::validateNodes
  */
 public function testValidateNodes()
 {
     $nodeData = array('alpha', 'alpha/a', 'alpha/a/b', 'alpha/a/b/c', 'beta', 'beta/a', 'beta/a/b', 'beta/a/b/c', 'gama', 'gama/a', 'gama/a/b', 'gama/a/b/c');
     $nodes = array();
     $c = new Collection();
     foreach ($nodeData as $path) {
         $n = new Node($path);
         $nodes[$path] = $n;
         $c->addNode($n);
     }
     $c->validateNodes();
     $nodeData = array('alpha/beta', 'alpha/beta/gama', 'alpha/beta-2/gama', 'test', 'test/beta', 'test/beta/gama');
     $nodes = array();
     $c = new Collection();
     foreach ($nodeData as $path) {
         $n = new Node($path);
         $nodes[$path] = $n;
         $c->addNode($n);
     }
     $this->setExpectedException('Navinator\\Exception', "The following node(s) do not have a parent node in this collection : 'alpha/beta', 'alpha/beta-2/gama'");
     $c->validateNodes();
 }