code: def test_learn_predict(self):
      ex = self.model.example("1 | a b c")
      init = self.model.predict(ex)
      assert init == 0
      self.model.learn(ex)
      assert self.model.predict(ex) > init
      ex = ["| a", "| b"]
      check_error_raises(TypeError, lambda: self.model.predict(ex))
      check_error_raises(TypeError, lambda: self.model.learn(ex))
  
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 2 for calling the TestVW obj's underlying member method code with example usage: obj.test_learn_predict() without return types