class_docstr: Test class for AthenaPartitioner when output data in Parquet format
code: def _s3_record(count):
      return {
          "Records": [
              {
                  "s3": {
                      "bucket": {"name": "unit-test-streamalerts"},
                      "object": {
                          "key": (
                              "parquet/alerts/dt=2017-08-{:02d}-"
                              "14/02/test.json".format(val + 1)
                          )
                      },
                  }
              }
              for val in range(count)
          ]
      }
  
imports: import json
  import os
  from mock import Mock, patch, call
  from nose.tools import assert_equal, assert_true
  from streamalert.athena_partitioner.main import AthenaPartitioner
  from streamalert.shared.config import load_config
  from tests.unit.helpers.aws_mocks import MockAthenaClient
label_desc: Use image node_id 6 for calling the TestAthenaPartitioner obj's underlying member method code with example usage: obj._s3_record(count) and returns: dict