text: import datetime as dt
  
  import pytest
  import pytz
  
  import stix2
  
  from .constants import CAMPAIGN_ID
  
  EXPECTED = """{
      "type": "campaign",
      "id": "campaign--8e2e2d2b-17d4-4cbf-938f-98ee46b3cd3f",
      "created_by_ref": "identity--f431f809-377b-45e0-aa1c-6a4751cae5ff",
      "created": "2016-04-06T20:03:00.000Z",
      "modified": "2016-04-06T20:03:00.000Z",
      "name": "Green Group Attacks Against Finance",
      "description": "Campaign by Green Group against a series of targets in the financial services sector."
  }"""
  
  
  def test_campaign_example():
      campaign = stix2.v20.Campaign(
          id="campaign--8e2e2d2b-17d4-4cbf-938f-98ee46b3cd3f",
          created_by_ref="identity--f431f809-377b-45e0-aa1c-6a4751cae5ff",
          created="2016-04-06T20:03:00Z",
          modified="2016-04-06T20:03:00Z",
          name="Green Group Attacks Against Finance",
          description="Campaign by Green Group against a series of targets in the financial services sector.",
      )
  
      assert str(campaign) == EXPECTED
  
  
  @pytest.mark.parametrize(
      "data", [
          EXPECTED,
          {
              "type": "campaign",
              "id": "campaign--8e2e2d2b-17d4-4cbf-938f-98ee46b3cd3f",
              "created": "2016-04-06T20:03:00Z",
              "modified": "2016-04-06T20:03:00Z",
              "created_by_ref": "identity--f431f809-377b-45e0-aa1c-6a4751cae5ff",
              "description": "Campaign by Green Group against a series of targets in the financial services sector.",
              "name": "Green Group Attacks Against Finance",
          },
      ],
  )
  def test_parse_campaign(data):
      cmpn = stix2.parse(data, version="2.0")
  
      assert cmpn.type == 'campaign'
      assert cmpn.id == CAMPAIGN_ID
      assert cmpn.created == dt.datetime(2016, 4, 6, 20, 3, 0, tzinfo=pytz.utc)
      assert cmpn.modified == dt.datetime(2016, 4, 6, 20, 3, 0, tzinfo=pytz.utc)
      assert cmpn.created_by_ref == "identity--f431f809-377b-45e0-aa1c-6a4751cae5ff"
      assert cmpn.description == "Campaign by Green Group against a series of targets in the financial services sector."
      assert cmpn.name == "Green Group Attacks Against Finance"
  
  # TODO: Add other examples
  