old_contents: import unittest
  
  import persian
  
  
  class TestEnglish(unittest.TestCase):
      def test_convert_english_numbers(self):
          self.assertEqual("۱۲۳۴۵۶۷۸۹۰",
                           persian.convert_en_numbers("1234567890"))
  
      def test_convert_english_chars(self):
          self.assertEqual("ضصثقفغعهخحجچگکمنتالبیسشظطزرذدپو./؟",
                           persian.convert_en_characters(
                               "qwertyuiop[]';lkjhgfdsazxcvbnm,./?"))
  
  
  class TestArabic(unittest.TestCase):
      def test_convert_arabic_numbers(self):
          self.assertEqual("۱۲۳۴۵۶۷۸۹۰",
                           persian.convert_ar_numbers("١٢٣٤٥٦٧٨٩٠"))
  
      def test_convert_arabic_chars(self):
          self.assertEqual("کدبزذشسیی",
                           persian.convert_ar_characters("كدبزذشسىي"))
  
new_contents: import unittest
  
  import persian
  
  
  class TestEnglish(unittest.TestCase):
      def test_convert_english_numbers(self):
          self.assertEqual("۱۲۳۴۵۶۷۸۹۰",
                           persian.convert_en_numbers("1234567890"))
  
      def test_convert_english_chars(self):
          self.assertEqual("ضصثقفغعهخحجچگکمنتالبیسشظطزرذدپو./؟",
                           persian.convert_en_characters(
                               "qwertyuiop[]';lkjhgfdsazxcvbnm,./?"))
  
  
  class TestArabic(unittest.TestCase):
      def test_convert_arabic_numbers(self):
          self.assertEqual("۱۲۳۴۵۶۷۸۹۰",
                           persian.convert_ar_numbers("١٢٣٤٥٦٧٨٩٠"))
  
      def test_convert_arabic_chars(self):
          self.assertEqual("کدبزذشسیی",
                           persian.convert_ar_characters("كدبزذشسىي"))
  
  
  class TestPersian(unittest.TestCase):
      def test_convert_fa_numbers(self):
          self.assertEqual("1234567890",
                           persian.convert_fa_numbers("۱۲۳۴۵۶۷۸۹۰"))
  
subject: Add test_convert_fa_numbers