code: def test_disk_out():
      disk_out = DiskOut()
      disk_out.sample()
      assert len(disk_out.samples) == 1
  
file_path: wandb/tests/pytest_tests/unit_tests/test_system_metrics/test_disk.py
imports: import threading
  from wandb.sdk.internal.settings_static import SettingsStatic
  from wandb.sdk.internal.system.assets import Disk
  from wandb.sdk.internal.system.assets.disk import DiskIn, DiskOut
  from wandb.sdk.internal.system.system_monitor import AssetInterface
label_desc: Use image node_id 3 for calling a global function with example usage: test_disk_out() without return types