text: # -*- coding: utf-8 -*-
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  # http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  import unittest
  
  from airflow.utils.module_loading import import_string
  
  
  class ModuleImportTestCase(unittest.TestCase):
      def test_import_string(self):
          cls = import_string('airflow.utils.module_loading.import_string')
          self.assertEqual(cls, import_string)
  
          # Test exceptions raised
          with self.assertRaises(ImportError):
              import_string('no_dots_in_path')
          msg = 'Module "airflow.utils" does not define a "nonexistent" attribute'
          with self.assertRaisesRegexp(ImportError, msg):
              import_string('airflow.utils.nonexistent')
  