docstr: Return a suite of all tests cases contained in the given module
  
  If the module is a package, load tests from all the modules in it.
  If the module has an ``additional_tests`` function, call it and add
  the return value to the tests.
docstr_tok: ["Return","a","suite","of","all","tests","cases","contained","in","the","given","module","If","the","module","is","a","package",",","load","tests","from","all","the","modules","in","it",".","If","the","module","has","an","``","additional_tests","``","function",",","call","it","and","add","the","return","value","to","the","tests","."]
code: def loadTestsFromModule(self, module, pattern=None):
      """Return a suite of all tests cases contained in the given module
  
      If the module is a package, load tests from all the modules in it.
      If the module has an ``additional_tests`` function, call it and add
      the return value to the tests.
      """
      if module in self._visited:
          return None
      self._visited.add(module)
  
      tests = []
      tests.append(TestLoader.loadTestsFromModule(self, module))
  
      if hasattr(module, "additional_tests"):
          tests.append(module.additional_tests())
  
      if hasattr(module, "__path__"):
          for file in resource_listdir(module.__name__, ""):
              if file.endswith(".py") and file != "__init__.py":
                  submodule = module.__name__ + "." + file[:-3]
              else:
                  if resource_exists(
                      module.__name__, file + "/__init__.py"
                  ):
                      submodule = module.__name__ + "." + file
                  else:
                      continue
              tests.append(self.loadTestsFromName(submodule))
  
      if len(tests) != 1:
          return self.suiteClass(tests)
      else:
          return tests[0]
  
imports: import os
  import operator
  import sys
  import contextlib
  import itertools
  import unittest
  from distutils.errors import DistutilsError, DistutilsOptionError
  from distutils import log
  from unittest import TestLoader
  from pkg_resources import resource_listdir, resource_exists, normalize_path, working_set, evaluate_marker, add_activation_listener, require
  from .._importlib import metadata
  from setuptools import Command
  from setuptools.extern.more_itertools import unique_everseen
  from setuptools.extern.jaraco.functools import pass_none
label_desc: Use image node_id 2 for calling the ScanningLoader obj's underlying member method code with example usage: obj.loadTestsFromModule(module, pattern) and returns: None, self, tests