class_docstr: Test shared Alert class.
docstr: Alert Class - Compute Common - No Nested Dictionaries
docstr_tok: ["Alert","Class","-","Compute","Common","-","No","Nested","Dictionaries"]
code: def test_compute_common_top_level(self):
      """Alert Class - Compute Common - No Nested Dictionaries"""
      record1 = {"a": 1, "b": 2, "c": 3}
      record2 = {"b": 2, "c": 3, "d": 4}
      record3 = {"c": 3, "d": 4, "e": 5}
      assert_equal(
          {"c": 3}, Alert._compute_common([record1, record2, record3])
      )
  
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 24 for calling the TestAlert obj's underlying member method code with example usage: obj.test_compute_common_top_level() without return types