gistfile1.rbx

  def test_invalidate_tree
    r1 = Category.create
    r2 = Category.create
    r3 = Category.create
    r4 = Category.create
    nodes = [r1, r2, r3, r4]
    
    r2.move_to_child_of(r1)
    nodes.each(&:reload)
    assert Category.valid?
    
    r3.move_to_child_of(r1)
    nodes.each(&:reload)
    assert Category.valid?
    
    r4.move_to_child_of(r2)
    nodes.each(&:reload)
    assert Category.valid?

    puts r1.children.inspect
  end