new_contents: # Copyright (c) 2015 Intel Corp.
  #
  # 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 testtools
  
  from sahara.utils import configs
  
  
  class ConfigsTestCase(testtools.TestCase):
  
      def test_merge_configs(self):
          a = {
              'HDFS': {
                  'param1': 'value1',
                  'param2': 'value2'
              }
          }
          b = {
              'HDFS': {
                  'param1': 'value3',
                  'param3': 'value4'
              },
              'YARN': {
                  'param5': 'value5'
              }
          }
  
          res = configs.merge_configs(a, b)
          expected = {
              'HDFS': {
                  'param1': 'value3',
                  'param2': 'value2',
                  'param3': 'value4'
              },
              'YARN': {
                  'param5': 'value5'
              }
          }
          self.assertEqual(expected, res)
  
subject: Add configs unit test case