code: def test_tz_str(self):
      assert_datetime_equality(
          self.factory.now("EST"), datetime.now(tz.gettz("EST"))
      )
  
imports: import time
  from datetime import date, datetime
  from decimal import Decimal
  import pytest
  from dateutil import tz
  from arrow import Arrow
  from arrow.parser import ParserError
  from .utils import assert_datetime_equality
label_desc: Use image node_id 3 for calling the TestNow obj's underlying member method code with example usage: obj.test_tz_str() without return types