Expand node not calling callback - extjs

Question

I am testing my ExtJs App with Jasmine. So there are no views involved.
I want to expand several nodes, but first my root node. But even expanding that node fails.
I create my TreeStore, then:
Code:
// oStore is my treestore, everything OK
// Here, I also tried calling oStore.load(); see below
var oNode = oStore.getNodeById( 'root' );
// oNode.isExpanded() says false
// oNode.hasChildNodes() says false
oNode.expand(false, function(oChildren) {
// it never gets here
console.log( "hello?");
});
My listener for load gets called, but the listener for beforeexpand does not get called.
If I call oStore.load() at the beginning after store creation, then when the on load listener gets called it says, oNode.childNodes.length has 3 children...
So why is expand()'s callback not called? How can I get that node to expand?
Why are the children of the node already loaded when calling oStore.load()? After that expand() is also not fired.
EDIT:
Starting my root node with expanded: true makes my store collapse correctly on collapse(), but after it expand() does nothing.
oNode.collapse(false, function() {
console.log( "collapse()" ); // works, but expand() afterwards does not
});

Answer 1

Found the solution. I need to wait for the store to get loaded. Is is a Jasmine issue:
runs( function() {
oStore.on( 'load', function() {
bStoreLoaded = true;
});
});
waitsFor( function() {
return bStoreLoaded;
}, " store to be loaded", 5000 );
runs( function() {
oNode.expand(false, function( aoChildren ) {
aoChildrenRoot = aoChildren;
bRootExpanded = true;
});
});

Answer 2

There is some convoluted logic in the source to tell the node whether or not it needs to expand or be expandable. Take a look at the code below that I ended up resorting to when I tried to manipulate the tree programmatically:
if (!parentNode.isExpanded() && !parentNode.isLeaf()) {
parentNode.expand(false, function () {// deal with open or closed paths
console.log('expanded parent to pick up new item');
});
} else {
parentNode.callStore('suspendAutoSync');
if (parentNode.isLeaf()) { // Parts that are leafs
parentNode.set("leaf", false); //must be set to work properly
parentNode.appendChild(newPart);
parentNode.expand(); //expand to show newly created child
} else {
parentNode.insertChild(0, newPart);
}
parentNode.callStore('resumeAutoSync');
}