<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def load_suite_from_stdin(self):
 """Load a test suite with test lines from the TAP stream on STDIN. :returns: A ``unittest.TestSuite`` instance """

        suite = unittest.TestSuite()
        rules = Rules("stream", suite)
        line_generator = self._parser.parse_stdin()
        return self._load_lines("stream", line_generator, suite, rules)