code: def test_buildx_not_installed(runner):
      with runner.isolated_filesystem():
          assert is_buildx_installed() is False
  
imports: import platform
  from unittest import mock
  import pytest
  from wandb.docker import is_buildx_installed, should_add_load_argument
label_desc: Use image node_id 2 for calling a global function with example usage: test_buildx_not_installed(runner) without return types