code: def test_public_vm(self, mocker):
      mocker.patch(
          "rai_core_flask.FlaskHelper._is_local_port_available",
          return_value=True,
      )
      service = FlaskHelper(ip="not localhost", with_credentials=False)
      assert isinstance(service.env, PublicVMEnvironment)
  
file_path: responsible-ai-toolbox/rai_core_flask/tests/test_environment_detector.py
imports: import os
  import pytest
  from rai_core_flask import FlaskHelper
  from rai_core_flask.environments.azure_nb_environment import AzureNBEnvironment
  from rai_core_flask.environments.credentialed_vm_environment import CredentialedVMEnvironment
  from rai_core_flask.environments.databricks_environment import DATABRICKS_ENV_VAR, DatabricksEnvironment
  from rai_core_flask.environments.local_ipython_environment import LocalIPythonEnvironment
  from rai_core_flask.environments.public_vm_environment import PublicVMEnvironment
label_desc: Use image node_id 2 for calling the TestEnvironmentDetector obj's underlying member method code with example usage: obj.test_public_vm(mocker) without return types