class_docstr: Test class to test ThreatStream functionalities
class_docstr_tok: ["Test","class","to","test","ThreatStream","functionalities"]
docstr: ThreatStream - Invoke Lambda Function
docstr_tok: ["ThreatStream","-","Invoke","Lambda","Function"]
code: def test_invoke_lambda_function(self, boto_mock):
      """ThreatStream - Invoke Lambda Function"""
      boto_mock.return_value = MockLambdaClient()
      self.threatstream._invoke_lambda_function("next_token")
      boto_mock.assert_called_once()
  
imports: from datetime import datetime
  import os
  import boto3
  from botocore.exceptions import ClientError
  from mock import Mock, patch
  from moto import mock_ssm
  from nose.tools import assert_equal, raises
  from streamalert.shared.config import load_config
  from streamalert.threat_intel_downloader.exceptions import ThreatStreamCredsError, ThreatStreamLambdaInvokeError, ThreatStreamRequestsError
  from streamalert.threat_intel_downloader.main import ThreatStream
  from tests.unit.streamalert.apps.test_helpers import MockLambdaClient
  from tests.unit.streamalert.shared.test_config import get_mock_lambda_context
  from tests.unit.streamalert.threat_intel_downloader.test_helpers import put_mock_params
label_desc: Use image node_id 30 for calling the TestThreatStream obj's underlying member method code with example usage: obj.test_invoke_lambda_function(boto_mock) without return types