code: def test_bytes_toplevel(self):
      self.assertEqual(json.dumps(b("\xe2\x82\xac")), r'"\u20ac"')
      self.assertRaises(UnicodeDecodeError, json.dumps, b("\xa4"))
      self.assertEqual(
          json.dumps(b("\xa4"), encoding="iso-8859-1"), r'"\u00a4"'
      )
      self.assertEqual(
          json.dumps(b("\xa4"), encoding="iso-8859-15"), r'"\u20ac"'
      )
      if PY3:
          self.assertRaises(
              TypeError, json.dumps, b("\xe2\x82\xac"), encoding=None
          )
          self.assertRaises(
              TypeError, json.dumps, b("\xa4"), encoding=None
          )
          self.assertEqual(
              json.dumps(
                  b("\xa4"), encoding=None, default=decode_iso_8859_15
              ),
              r'"\u20ac"',
          )
      else:
          self.assertEqual(
              json.dumps(b("\xe2\x82\xac"), encoding=None), r'"\u20ac"'
          )
          self.assertRaises(
              UnicodeDecodeError, json.dumps, b("\xa4"), encoding=None
          )
          self.assertRaises(
              UnicodeDecodeError,
              json.dumps,
              b("\xa4"),
              encoding=None,
              default=decode_iso_8859_15,
          )
  
imports: from unittest import TestCase
  from simplejson.compat import StringIO, long_type, b, binary_type, text_type, PY3
  import simplejson
label_desc: Use image node_id 12 for calling the TestDump obj's underlying member method code with example usage: obj.test_bytes_toplevel() without return types