text: import pytest
  
  from kgx.config import get_biolink_model_schema
  
  
  def test_valid_biolink_version():
      try:
          schema = get_biolink_model_schema("2.2.1")
      except TypeError as te:
          assert False, "test failure!"
      assert(schema == 'https://raw.githubusercontent.com/biolink/biolink-model/2.2.1/biolink-model.yaml')
  
  
  def test_invalid_biolink_version():
      try:
          schema = get_biolink_model_schema()
      except TypeError as te:
          assert True, "Type error expected: passed the invalid non-semver, type error: " + str(te)
  