docstr: AlertPublisher - AlertPublisherRepository - create_composite_publisher() - Default
docstr_tok: ["AlertPublisher","-","AlertPublisherRepository","-","create_composite_publisher","(",")","-","Default"]
code: def test_create_composite_publisher_default():
      """AlertPublisher - AlertPublisherRepository - create_composite_publisher() - Default"""
      publisher = AlertPublisherRepository.create_composite_publisher(
          []
      )
  
      assert_true(isinstance(publisher, DefaultPublisher))
  
imports: from mock import patch
  from nose.tools import assert_true, assert_equal, assert_false
  from streamalert.alert_processor.helpers import _assemble_alert_publisher_for_output
  from streamalert.shared.publisher import AlertPublisherRepository, AlertPublisher, CompositePublisher, DefaultPublisher, Register, WrappedFunctionPublisher
  from tests.unit.streamalert.alert_processor.helpers import get_alert
label_desc: Use image node_id 10 for calling the TestAlertPublisherRepository obj's underlying member method code with example usage: obj.test_create_composite_publisher_default() without return types