old_contents: from pyqode.core.modes import CheckerMessages
  from pyqode.json.modes.linter import json_linter
  
  
  def test_valid_json():
      with open('test/files/example.json', 'r') as f:
          code = f.read()
      status, errors = json_linter({'code': code})
      assert status is True
      assert len(errors) == 0
  
  
  def test_invalid_json():
      with open('test/files/invalid.json', 'r') as f:
          code = f.read()
      status, errors = json_linter({'code': code})
      assert status is True
      assert len(errors) == 1
      assert isinstance(errors[0][0], str)
      assert errors[0][1] == CheckerMessages.ERROR
      assert errors[0][2] == 11
      assert errors[0][3] == 13
  
new_contents: from pyqode.core.modes import CheckerMessages
  from pyqode.json.modes.linter import json_linter
  
  
  def test_valid_json():
      with open('test/files/example.json', 'r') as f:
          code = f.read()
      errors = json_linter({'code': code})
      assert len(errors) == 0
  
  
  def test_invalid_json():
      with open('test/files/invalid.json', 'r') as f:
          code = f.read()
      errors = json_linter({'code': code})
      assert len(errors) == 1
      assert isinstance(errors[0][0], str)
      assert errors[0][1] == CheckerMessages.ERROR
      assert errors[0][2] == 11
      assert errors[0][3] == 13
  
subject: Fix tests