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