class_docstr: Tests the DynamoDB Driver, but it tests with a variety of drivers built over the same table,
  different columns.
class_docstr_tok: ["Tests","the","DynamoDB","Driver",",","but","it","tests","with","a","variety","of","drivers","built","over","the","same","table",",","different","columns","."]
docstr: LookupTables - Drivers - DynamoDB Multi Driver - String - Get Key
docstr_tok: ["LookupTables","-","Drivers","-","DynamoDB","Multi","Driver","-","String","-","Get","Key"]
code: def test_get_string(self):
      """LookupTables - Drivers - DynamoDB Multi Driver - String - Get Key"""
      self._string_driver.initialize()
      assert_equal(
          self._string_driver.get("aaaa-bbbb-cccc"), "hello world!"
      )
  
imports: from datetime import datetime
  from mock import patch
  from botocore.exceptions import ReadTimeoutError
  from moto import mock_dynamodb2
  from nose.tools import assert_equal, assert_false, assert_raises, assert_true
  from streamalert.shared.config import load_config
  from streamalert.shared.lookup_tables.drivers_factory import construct_persistence_driver
  from streamalert.shared.lookup_tables.errors import LookupTablesInitializationError
  from tests.unit.helpers.aws_mocks import put_mock_dynamod_data
label_desc: Use image node_id 5 for calling the TestDynamoDBDriver_MultiTable obj's underlying member method code with example usage: obj.test_get_string() without return types