code: def test_project_name_env_var(self):
      os.environ[PROJECT_ENV_NAME] = self.PROJECT_NAME
  
      with init_project(mode="sync") as project:
          project["some/variable"] = 13
          self.assertEqual(13, project["some/variable"].fetch())
  
imports: import os
  import unittest
  from mock import patch
  from neptune import ANONYMOUS_API_TOKEN, init_project
  from neptune.common.exceptions import NeptuneException
  from neptune.common.warnings import NeptuneWarning, warned_once
  from neptune.envs import API_TOKEN_ENV_NAME, PROJECT_ENV_NAME
  from neptune.exceptions import NeptuneMissingProjectNameException
  from neptune.internal.backends.api_model import Attribute, AttributeType, IntAttribute
  from neptune.internal.backends.neptune_backend_mock import NeptuneBackendMock
  from neptune.metadata_containers.utils import prepare_nql_query
  from tests.unit.neptune.new.client.abstract_experiment_test_mixin import AbstractExperimentTestMixin
label_desc: Use image node_id 7 for calling the TestClientProject obj's underlying member method code with example usage: obj.test_project_name_env_var() without return types