<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def set_estimate(self, bitrate: int, now_ms: int):
 """ For testing purposes. """

        self.current_bitrate = self._clamp_bitrate(bitrate, bitrate)
        self.current_bitrate_initialized = True
        self.last_change_ms = now_ms