old_contents: import daemon
  
  class TestModuleTest(daemon.ModuleCase):
      '''
      Validate the test module
      '''
      def test_ping(self):
          '''
          test.ping
          '''
          self.assertTrue(self.run_function('test.ping'))
  
new_contents: import saltunittest
  
  class TestModuleTest(saltunittest.ModuleCase):
      '''
      Validate the test module
      '''
      def test_ping(self):
          '''
          test.ping
          '''
          self.assertTrue(self.run_function('test.ping'))
  
      def test_echo(self):
          '''
          test.echo
          '''
          self.assertEqual(self.run_function('test.echo', ['text']), 'text')
  
subject: Add test.echo test