title says it all ;-)

Below is a test that exposes the misbehaviour for the case of removing a selected CheckBoxTreeItem, Too lazy to write the tests for other list modifications, but pretty sure that it's the same for adding/replacing items

    /**
     * CheckBoxTreeItem must update parent state when modifying the
     * children list.
     */
    @Test
    public void testCheckBoxTreeItemDataModification() {
        CheckBoxTreeItem checkBoxRoot = createCheckBoxSubTree("checked-root");
        checkBoxRoot.setExpanded(true);
        tree.setRoot(checkBoxRoot);
        CheckBoxTreeItem child = (CheckBoxTreeItem) checkBoxRoot.getChildren().get(2);
        child.setSelected(true);
        assertTrue(checkBoxRoot.isIndeterminate());
        root.getChildren().remove(child);
        assertFalse("root must update its check state on modifications to children list",
                checkBoxRoot.isIndeterminate());
    }

    protected CheckBoxTreeItem createCheckBoxItem(Object item) {
        return new CheckBoxTreeItem(item);
    }

    protected ObservableList<CheckBoxTreeItem> createCheckBoxItems(ObservableList other) {
        ObservableList items = FXCollections.observableArrayList();
        other.stream().forEach(item -> items.add(createCheckBoxItem(item)));
        return items;
    }

    protected CheckBoxTreeItem createCheckBoxSubTree(Object item) {
        CheckBoxTreeItem child = createCheckBoxItem(item);
        child.getChildren().setAll(createCheckBoxItems(rawItems));
        return child;
    }