Just for reference: instead of @pytest.mark.hookwrapper @pytest.hookimpl(hookwrapper=True) should be used.
Related code:

pytest/src/_pytest/config/__init__.py

Lines 259 to 287 in 19035f4

    
           def parse_hookimpl_opts(self, plugin, name): 
        
               # pytest hooks are always prefixed with pytest_ 
        
               # so we avoid accessing possibly non-readable attributes 
        
               # (see issue #1073) 
        
               if not name.startswith("pytest_"): 
        
                   return 
        
               # ignore names which can not be hooks 
        
               if name == "pytest_plugins": 
        
                   return 
        
               method = getattr(plugin, name) 
        
               opts = super(PytestPluginManager, self).parse_hookimpl_opts(plugin, name) 
        
               # consider only actual functions for hooks (#3775) 
        
               if not inspect.isroutine(method): 
        
                   return 
        
               # collect unmarked hooks as long as they have the `pytest_' prefix 
        
               if opts is None and name.startswith("pytest_"): 
        
                   opts = {} 
        
               if opts is not None: 
        
                   # TODO: DeprecationWarning, people should use hookimpl 
        
                   # https://github.com/pytest-dev/pytest/issues/4562 
        
                   known_marks = {m.name for m in getattr(method, "pytestmark", [])} 
        
                   for name in ("tryfirst", "trylast", "optionalhook", "hookwrapper"): 
        
                       opts.setdefault(name, hasattr(method, name) or name in known_marks) 
        
               return opts

(I've just came along about a plugin using @pytest.mark.hookwrapper and looked it up)

	def parse_hookimpl_opts(self, plugin, name):
	# pytest hooks are always prefixed with pytest_
	# so we avoid accessing possibly non-readable attributes
	# (see issue #1073)
	if not name.startswith("pytest_"):
	return
	# ignore names which can not be hooks
	if name == "pytest_plugins":
	return

	method = getattr(plugin, name)
	opts = super(PytestPluginManager, self).parse_hookimpl_opts(plugin, name)

	# consider only actual functions for hooks (#3775)
	if not inspect.isroutine(method):
	return

	# collect unmarked hooks as long as they have the `pytest_' prefix
	if opts is None and name.startswith("pytest_"):
	opts = {}
	if opts is not None:
	# TODO: DeprecationWarning, people should use hookimpl
	# https://github.com/pytest-dev/pytest/issues/4562
	known_marks = {m.name for m in getattr(method, "pytestmark", [])}

	for name in ("tryfirst", "trylast", "optionalhook", "hookwrapper"):

	opts.setdefault(name, hasattr(method, name) or name in known_marks)
	return opts

Uh oh!

deprecate marker based hook metadata #4562

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