'Add the results from the other *result* to this result.'

def add_results(self, result):

    self.stream.write(result.stream.getvalue())
    self.stream.flush()
    self.testsRun += result.testsRun
    self.failures.extend(result.failures)
    self.errors.extend(result.errors)
    self.skipped.extend(result.skipped)
    self.expectedFailures.extend(result.expectedFailures)
    self.unexpectedSuccesses.extend(result.unexpectedSuccesses)
