code: def test_get_model_unknown_model_signals_error(self):
      with self.assertRaisesRegex(ValueError, "Unknown model"):
          modeling.get_model("unknown_model_1234")
  
imports: from absl.testing import absltest
  from absl.testing import parameterized
  import numpy
  import tensorflow
  import tf_slim
  from deepvariant import dv_constants
  from deepvariant import dv_utils_using_clif
  from deepvariant import modeling
label_desc: Use image node_id 2 for calling the ModelingTest obj's underlying member method code with example usage: obj.test_get_model_unknown_model_signals_error() without return types