new_contents: from io import BytesIO
  from unittest import TestCase
  
  import bigjson
  
  
  MISSING_OPEN_QUOTE_JSON_FILE = b"""
  {
      "object": {
          "x": y"
      }
  }
  """
  
  CORRUPT_BACKSLASH_ENCODING_JSON_FILE = b"""
  {
      "string": "\qblah"
  }
  """
  
  MISSING_DIGIT_AFTER_DOT_JSON_FILE = b"""
  {
      "number": 14.
  }
  """
  
  
  class TestCorruption(TestCase):
  
      def test_missing_open_quote(self):
          file = BytesIO(MISSING_OPEN_QUOTE_JSON_FILE)
          data = bigjson.load(file)
  
          with self.assertRaises(Exception) as e:
              _ = len(data)
  
          self.assertEqual(e.exception.args[0], "Unexpected bytes! Value 'y' Position 32")
  
      def test_corrupt_backslash_encoding(self):
          file = BytesIO(CORRUPT_BACKSLASH_ENCODING_JSON_FILE)
          data = bigjson.load(file)
  
          with self.assertRaises(Exception) as e:
              _ = len(data)
  
          self.assertEqual(e.exception.args[0], "Unexpected \\q in backslash encoding! Position 19")
  
      def test_missing_digit_after_dot(self):
          file = BytesIO(MISSING_DIGIT_AFTER_DOT_JSON_FILE)
          data = bigjson.load(file)
  
          with self.assertRaises(Exception) as e:
              _ = len(data)
  
          self.assertEqual(e.exception.args[0], "Expected digit after dot! Position 21")
  
  
subject: Add tests for improved exception messages