class_docstr: Test class for AthenaPartitioner when output data in Parquet format
docstr: AthenaPartitioner - Run, Placeholder File
docstr_tok: ["AthenaPartitioner","-","Run",",","Placeholder","File"]
code: def test_run_placeholder_file(self, log_mock):
      """AthenaPartitioner - Run, Placeholder File"""
      self._partitioner.run(self._create_test_message(1, True))
      log_mock.assert_has_calls(
          [
              call(
                  "Skipping placeholder file notification with key: %s",
                  b"parquet/alerts/dt=2017-08-01-14/02/test.json_$folder$",
              )
          ]
      )
  
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 10 for calling the TestAthenaPartitioner obj's underlying member method code with example usage: obj.test_run_placeholder_file(log_mock) without return types