code: def test_cast_parser(self):
      values = ("4:10", "1.2m", "172 hours", "5 weeks, 2 days", "n/a")
      casted = tuple(self.type.cast(v) for v in values)
      self.assertSequenceEqual(
          casted,
          (
              datetime.timedelta(minutes=4, seconds=10),
              datetime.timedelta(minutes=1, seconds=12),
              datetime.timedelta(hours=172),
              datetime.timedelta(weeks=5, days=2),
              None,
          ),
      )
  
imports: import datetime
  import pickle
  import unittest
  from decimal import Decimal
  import parsedatetime
  from agate.data_types import Boolean, Date, DateTime, Number, Text, TimeDelta
  from agate.exceptions import CastError
label_desc: Use image node_id 3 for calling the TestTimeDelta obj's underlying member method code with example usage: obj.test_cast_parser() without return types