def METHOD_NAME():
    # Require a VG name or UUID at initialization.
    # Empty constructor shall raise.
    with pytest.raises(ValueError):
        e = storage_exception.VolumeGroupDoesNotExist()
    # Expected error type is LVMCommandError.
    with pytest.raises(TypeError):
        e = storage_exception.VolumeGroupDoesNotExist("vg-name", error="error")
    # Correct initialization.
    fake_error = storage_exception.LVMCommandError(
        rc=5, cmd=["fake"], out=["fake output"], err=["fake error"])
    e = storage_exception.VolumeGroupDoesNotExist("vg-name", error=fake_error)
    assert e.error == fake_error
    # Check error format
    formatted = str(e)
    assert "vg_name=vg-name" in formatted
    assert "error=" in formatted
    assert "vg_uuid=" not in formatted