class_docstr: Tests for merger/main.py:AlertMerger class
class_docstr_tok: ["Tests","for","merger\/main.py",":","AlertMerger","class"]
docstr: Alert Merger - All Alerts Have Already Been Dispatched
docstr_tok: ["Alert","Merger","-","All","Alerts","Have","Already","Been","Dispatched"]
code: def test_dispatch_no_alerts(self, mock_logger):
      """Alert Merger - All Alerts Have Already Been Dispatched"""
      with patch.object(
          self.merger.table,
          "rule_names_generator",
          return_value=iter(["rule_name"]),
      ):
          self.merger.dispatch()
          mock_logger.assert_not_called()
  
imports: from datetime import datetime, timedelta
  import os
  from mock import ANY, call, patch, MagicMock
  from moto import mock_dynamodb2, mock_lambda
  from nose.tools import assert_equal, assert_false, assert_true
  from streamalert.alert_merger import main
  from streamalert.shared.alert import Alert
  from tests.unit.helpers.aws_mocks import create_lambda_function, setup_mock_alerts_table
label_desc: Use image node_id 9 for calling the TestAlertMerger obj's underlying member method code with example usage: obj.test_dispatch_no_alerts(mock_logger) without return types