<filename>test/unit/reference_dummy.py
class ReferenceDummy():
  def __init__(self, *args):
      return

  def _to_dict(self, *args):
    return "dummy"

<filename>test/unit/reference_dummy.py
class ReferenceDummy():
  def __init__(self, *args):
      return

  def _to_dict(self, *args):
    return "dummy"
