class_docstr: Tests for merger/main.py:AlertMerger class
class_docstr_tok: ["Tests","for","merger\/main.py",":","AlertMerger","class"]
docstr: Alert Merger - Alert Collection - All Alerts Too Recent to Merge
docstr_tok: ["Alert","Merger","-","Alert","Collection","-","All","Alerts","Too","Recent","to","Merge"]
code: def test_merge_groups_too_recent(self):
      """Alert Merger - Alert Collection - All Alerts Too Recent to Merge"""
      alerts = [
          Alert(
              "",
              {"key": True},
              set(),
              merge_by_keys=["key"],
              merge_window=timedelta(minutes=10),
          )
      ]
      assert_equal([], main.AlertMerger._merge_groups(alerts))
  
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 4 for calling the TestAlertMerger obj's underlying member method code with example usage: obj.test_merge_groups_too_recent() without return types