old_contents: # encoding: utf-8
  
  """
  .. codeauthor:: Tsuyoshi Hombashi <tsuyoshi.hombashi@gmail.com>
  """
  
  from __future__ import unicode_literals
  
  import itertools
  
  import pytest
  from typepy import is_not_null_string, is_null_string
  
  
  nan = float("nan")
  inf = float("inf")
  
  
  class Test_is_not_empty_string(object):
  
      @pytest.mark.parametrize(
          ["value", "expected"],
          list(itertools.product(
              ["nan", "テスト"],
              [True]
          )) + list(itertools.product(
              [None, "", "  ", "\t", "\r\n", "\n", [], 1, True, nan],
              [False]
          )))
      def test_normal(self, value, expected):
          assert is_not_null_string(value) == expected
  
  
  class Test_is_empty_string(object):
  
      @pytest.mark.parametrize(
          ["value", "expected"],
          list(itertools.product(
              [None, "", "  ", "\t", "\r\n", "\n", ],
              [True]
          )) + list(itertools.product(
              ["nan", "テスト", [], 1, True, nan],
              [False]
          )))
      def test_normal(self, value, expected):
          assert is_null_string(value) == expected
  
new_contents: # encoding: utf-8
  
  """
  .. codeauthor:: Tsuyoshi Hombashi <tsuyoshi.hombashi@gmail.com>
  """
  
  from __future__ import unicode_literals
  
  import itertools
  
  import pytest
  from typepy import is_not_null_string, is_null_string
  
  
  nan = float("nan")
  inf = float("inf")
  
  
  class Test_is_not_null_string(object):
  
      @pytest.mark.parametrize(
          ["value", "expected"],
          list(itertools.product(
              ["nan", "テスト"],
              [True]
          )) + list(itertools.product(
              [None, "", "  ", "\t", "\r\n", "\n", [], 1, True, nan],
              [False]
          )))
      def test_normal(self, value, expected):
          assert is_not_null_string(value) == expected
  
  
  class Test_is_null_string(object):
  
      @pytest.mark.parametrize(
          ["value", "expected"],
          list(itertools.product(
              [None, "", "  ", "\t", "\r\n", "\n", ],
              [True]
          )) + list(itertools.product(
              ["nan", "テスト", [], 1, True, nan],
              [False]
          )))
      def test_normal(self, value, expected):
          assert is_null_string(value) == expected
  
subject: Fix test class names