Added tests for TreeModel::getParent
Added tests for TreeModel::isRoot
Added tests for TreeModel::isLeaf
Added tests for TreeModel::isDescendantOf
Added tests for TreeModel::isSelfOrDescendantOf
Added tests for TreeModel::equals
Added tests for TreeModel::inSameScope
Added tests for TreeModel::scopeImmediateDescendants
Added tests for TreeModel::getRoot
Added tests for TreeModel::getNestedList