class_docstr: A wrapper for SphinxTestApp.
  
  This class is used to speed up the test by skipping ``app.build()``
  if it has already been built and there are any output files.
code: def __init__(self, app_: SphinxTestApp) -> None:
      self.app = app_
  
imports: from __future__ import annotations
  import contextlib
  import os
  import re
  import sys
  import warnings
  from typing import IO, TYPE_CHECKING, Any
  from xml.etree import ElementTree
  from docutils import nodes
  from sphinx import application
label_desc: Use image node_id 1 to create a new SphinxTestAppWrapperForSkipBuilding object  with example: obj = SphinxTestAppWrapperForSkipBuilding(app_)