Test description says:

Wait till the image like a REF1 will be shown on the Screen. Click mouse button or press a key to set focusable attribute of Node to false. Press on any key and click on the Node several times.
If Node has focusable attribute set to false it doesn't accept input focus. Nodes presented on the Screen shouldn't change their size when user presses the keys on them, but should change their size if user clicks on them.

When focusable attribute set to false, after mouse clicking or key pressing it switches to true and nodes are resizable.