class TestProf::MemoryProf::Tracker::LinkedListNode

def add_nested(node)
  @nested_memory += node.total_memory
end

def finish(memory_at_finish)
  @memory_at_finish = memory_at_finish
  previous&.add_nested(self)
end

def hooks_memory
  total_memory - nested_memory
end

def initialize(id:, item:, memory_at_start:, previous:)
  @id = id
  @item = item
  @previous = previous
  @memory_at_start = memory_at_start || 0
  @memory_at_finish = nil
  @nested_memory = 0
end

def total_memory
  return 0 if memory_at_finish.nil?
  # It seems that on Windows Minitest may release a lot of memory to
  # the OS when it finishes and executes #report, leading to memory_at_finish
  # being less than memory_at_start. In this case we return nested_memory
  # which does not account for the memory used in `after` hooks, but it
  # is better than nothing.
  return nested_memory if memory_at_start > memory_at_finish
  memory_at_finish - memory_at_start
end