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我正在使用python制作Raspberry Pi程序.我想写unittest我的python代码.如何获得输出状态GPIO？

测试目标类是下面的.我想在调用stop,brake,rotateClockwise和rotateCounterClockwise后检查输出.

import RPi.GPIO as GPIO
# moter management class, with like TA7291P
class MoterManager:
    def __init__(self, in1Pin, in2Pin):
        self.__in1Pin = in1Pin
        self.__in2Pin = in2Pin

    def stop(self):
        self.__offIn1()
        self.__offIn2()

    def brake(self):
        elf.__onIn1()
        self.__onIn2()

    def rotateClockwise(self):
        self.__onIn1()
        self.__offIn2()

    def rotateCounterClockwise(self):
        self.__offIn1()
        self.__onIn2()

    def __onIn1(self):
        GPIO.output( self.__in1Pin, True)
        print "In1 on"

    def __onIn2(self):
        GPIO.output( self.__in2Pin, True)
        print "In2 on"

    def __offIn1(self):
        GPIO.output( self.__in1Pin, False )
        print "In1 off"

    def __offIn2(self):
        GPIO.output( self.__in2Pin, False )
        print "In2 off"