new_contents: from contextlib import contextmanager
  
  from matrixstore.tests.matrixstore_factory import (
      matrixstore_from_data_factory,
      patch_global_matrixstore,
  )
  
  
  @contextmanager
  def patched_global_matrixstore(matrixstore):
      """Context manaager that patches the global MatrixStore instance with the supplied
      matrixstore.
      """
      stop_patching = patch_global_matrixstore(matrixstore)
      try:
          yield
      finally:
          stop_patching()
  
  
  @contextmanager
  def patched_global_matrixstore_from_data_factory(factory):
      """Context manaager that patches the global MatrixStore instance with one built from
      the supplied factory.
      """
      matrixstore = matrixstore_from_data_factory(factory)
      with patched_global_matrixstore(matrixstore):
          yield
  
subject: Add context managers for patching global matrixstore in tests