class_docstr: Test shared Alert class.
code: def _basic_alert():
      return Alert(
          "test_rule",
          {"abc": 123},
          {"aws-firehose:alerts", "aws-sns:test-output"},
      )
  
imports: import copy
  from datetime import datetime, timedelta
  import json
  from nose.tools import assert_equal, assert_false, assert_is_instance, assert_not_in, assert_raises, assert_true
  from streamalert.shared.alert import Alert, AlertCreationError
label_desc: Use image node_id 1 for calling the TestAlert obj's underlying member method code with example usage: obj._basic_alert() and returns: Alert