code: def test_error_raise(self, input_param):
      with self.assertRaises((ValueError, NotImplementedError)):
          FlexibleUNet(**input_param)
  
imports: from __future__ import annotations
  import unittest
  import torch
  from parameterized import parameterized
  from monai.networks import eval_mode
  from monai.networks.blocks.encoder import BaseEncoder
  from monai.networks.nets import FLEXUNET_BACKBONE, EfficientNetBNFeatures, FlexibleUNet, FlexUNetEncoderRegister, ResNet, ResNetBlock, ResNetBottleneck
  from monai.utils import optional_import
  from tests.utils import skip_if_downloading_fails, skip_if_quick
label_desc: Use image node_id 3 for calling the TestFLEXIBLEUNET obj's underlying member method code with example usage: obj.test_error_raise(input_param) without return types