new_contents: # Copyright 2019 D-Wave Systems Inc.
  #
  #    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
  
  import dimod
  from dimod.serialization.format import sampleset_to_string
  
  
  class Test_sampleset_to_string(unittest.TestCase):
      def test_smoke(self):
          # test that nothing falls down or explodes, most 'tests' would be in
          # the doctests
          samples = dimod.ExactSolver().sample_ising({v: -v - 1 for v in range(5)}, {})
          str(samples)
  
subject: Add one smoketest to str(sampleset)