class_docstr: Test class for SlackOutput
class_docstr_tok: ["Test","class","for","SlackOutput"]
docstr: SlackOutput - JSON to Slack mrkdwn, Simple String
docstr_tok: ["SlackOutput","-","JSON","to","Slack","mrkdwn",",","Simple","String"]
code: def test_json_to_slack_mrkdwn_str(self):
      """SlackOutput - JSON to Slack mrkdwn, Simple String"""
      simple_str = "value to format"
      result = SlackOutput._json_to_slack_mrkdwn(simple_str, 0)
  
      assert_equal(len(result), 1)
      assert_equal(result[0], simple_str)
  
imports: from collections import Counter, OrderedDict
  from mock import patch, Mock, MagicMock
  from nose.tools import assert_equal, assert_false, assert_true, assert_set_equal
  from streamalert.alert_processor.helpers import compose_alert
  from streamalert.alert_processor.outputs.slack import SlackOutput
  from tests.unit.streamalert.alert_processor.helpers import get_random_alert, get_alert
label_desc: Use image node_id 10 for calling the TestSlackOutput obj's underlying member method code with example usage: obj.test_json_to_slack_mrkdwn_str() without return types