old_contents: """Tests for PythonExporter"""
  
  #-----------------------------------------------------------------------------
  # Copyright (c) 2013, the IPython Development Team.
  #
  # Distributed under the terms of the Modified BSD License.
  #
  # The full license is in the file COPYING.txt, distributed with this software.
  #-----------------------------------------------------------------------------
  
  #-----------------------------------------------------------------------------
  # Imports
  #-----------------------------------------------------------------------------
  
  from .base import ExportersTestsBase
  from ..python import PythonExporter
  
  #-----------------------------------------------------------------------------
  # Class
  #-----------------------------------------------------------------------------
  
  class TestPythonExporter(ExportersTestsBase):
      """Tests for PythonExporter"""
  
      exporter_class = PythonExporter
      should_include_raw = ['python']
  
      def test_constructor(self):
          """
          Can a PythonExporter be constructed?
          """
          PythonExporter()
  
  
      def test_export(self):
          """
          Can a PythonExporter export something?
          """
          (output, resources) = PythonExporter().from_filename(self._get_notebook())
          assert len(output) > 0
new_contents: """Tests for PythonExporter"""
  
  # Copyright (c) IPython Development Team.
  # Distributed under the terms of the Modified BSD License.
  
  from .base import ExportersTestsBase
  from ..python import PythonExporter
  
  
  class TestPythonExporter(ExportersTestsBase):
      """Tests for PythonExporter"""
  
      exporter_class = PythonExporter
      should_include_raw = ['python']
  
      def test_constructor(self):
          """Can a PythonExporter be constructed?"""
          self.exporter_class()
  
      def test_export(self):
          """Can a PythonExporter export something?"""
          (output, resources) = self.exporter_class().from_filename(self._get_notebook())
          self.assertIn("coding: utf-8", output)
  
subject: verify that the coding marker is in Python export