text: import unittest
  
  from install import utils
  
  
  class TestPrintWarning(unittest.TestCase):
  
      def test_print_warning(self):
          utils.print_warning('This is a test.')
  
  
  class TestSearchOnPath(unittest.TestCase):
  
      def test_exec_not_found(self):
          self.assertIsNone(utils.search_on_path(['no_such_exec']))
  