old_contents: import datetime as dt
  import json
  
  import pytest
  import pytz
  
  from stix2.base import STIXJSONEncoder
  
  
  def test_encode_json_datetime():
      now = dt.datetime(2017, 3, 22, 0, 0, 0, tzinfo=pytz.UTC)
      test_dict = {'now': now}
  
      expected = '{"now": "2017-03-22T00:00:00Z"}'
      assert json.dumps(test_dict, cls=STIXJSONEncoder) == expected
  
  
  def test_encode_json_object():
      obj = object()
      test_dict = {'obj': obj}
  
      with pytest.raises(TypeError) as excinfo:
          json.dumps(test_dict, cls=STIXJSONEncoder)
  
      assert " is not JSON serializable" in str(excinfo.value)
  
new_contents: import datetime as dt
  import json
  import uuid
  
  import pytest
  import pytz
  
  import stix2
  from stix2.base import STIXJSONEncoder
  
  
  def test_encode_json_datetime():
      now = dt.datetime(2017, 3, 22, 0, 0, 0, tzinfo=pytz.UTC)
      test_dict = {'now': now}
  
      expected = '{"now": "2017-03-22T00:00:00Z"}'
      assert json.dumps(test_dict, cls=STIXJSONEncoder) == expected
  
  
  def test_encode_json_object():
      obj = object()
      test_dict = {'obj': obj}
  
      with pytest.raises(TypeError) as excinfo:
          json.dumps(test_dict, cls=STIXJSONEncoder)
  
      assert " is not JSON serializable" in str(excinfo.value)
  
  
  def test_deterministic_id_unicode():
      mutex = {'name': u'D*Fl#Ed*\u00a3\u00a8', 'type': 'mutex'}
      obs = stix2.parse_observable(mutex, version="2.1")
  
      dd_idx = obs.id.index("--")
      id_uuid = uuid.UUID(obs.id[dd_idx+2:])
  
      assert id_uuid.variant == uuid.RFC_4122
      assert id_uuid.version == 5
  
subject: Add a unit test for deterministic ID, with unicode