code: def test_read_bytes(self):
      mock = mock_open(read_data=b"\xc6")
      with patch("%s.open" % __name__, mock, create=True):
          with open("abc", "rb") as f:
              result = f.read()
      self.assertEqual(result, b"\xc6")
  
imports: import unittest
  from warnings import catch_warnings
  from test.test_unittest.testmock.support import is_instance
  from unittest.mock import MagicMock, Mock, patch, sentinel, mock_open, call
label_desc: Use image node_id 10 for calling the TestMockOpen obj's underlying member method code with example usage: obj.test_read_bytes() without return types