code: def test_cast(self):
      values = (2, 1, None, Decimal("2.7"), "n/a", "2.7", "200,000,000")
      casted = tuple(self.type.cast(v) for v in values)
      self.assertSequenceEqual(
          casted,
          (
              Decimal("2"),
              Decimal("1"),
              None,
              Decimal("2.7"),
              None,
              Decimal("2.7"),
              Decimal("200000000"),
          ),
      )
  
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 TestNumber obj's underlying member method code with example usage: obj.test_cast() without return types