code: def test_merge_models():
      model1 = vowpalwabbit.Workspace(quiet=True)
      model1.learn("1 | foo")
      model1.learn("1 | foo")
      model2 = vowpalwabbit.Workspace(quiet=True)
      model2.learn("1 | bar")
      model2.learn("1 | bar")
      model2.learn("1 | bar")
  
      merged_model = vowpalwabbit.merge_models(None, [model1, model2])
      assert (
          merged_model.get_weighted_examples()
          == model1.get_weighted_examples()
          + model2.get_weighted_examples()
      )
      assert model1.get_weight_from_name("foo") != 0
      assert model1.get_weight_from_name("bar") == 0
      assert merged_model.get_weight_from_name("foo") != 0
      assert model2.get_weight_from_name("foo") == 0
      assert model2.get_weight_from_name("bar") != 0
      assert merged_model.get_weight_from_name("bar") != 0
  
imports: import os
  from pathlib import Path
  import vowpalwabbit
  from vowpalwabbit import Workspace
  import pytest
  import warnings
  import filecmp
label_desc: Use image node_id 50 for calling a global function with example usage: test_merge_models() without return types