在 function 中设置局部变量以进行单元测试 kotlin

Question

我正在尝试测试ZC1C425268E685D1AB5074C17A94F14Z在ZC31B31B32364CE19CA8FC150A417ECCE58Z中。 继承人的代码：

 fun needToBeTested(serviceContext: Context):Int
    {
        val manager = serviceContext.getSystemService(Context.USB_SERVICE) as UsbManager
        val deviceList = manager.deviceList
        

            if(deviceList.size != 0){
                val deviceIterator = deviceList.values.iterator()
                while (deviceIterator.hasNext()) {
                    val device = deviceIterator.next()
                    
                    if ((device != null)&&(device.deviceClass == 255)) {   // USB_CLASS_VENDOR_SPEC - HUB
                        val permitToRead:Boolean = manager.hasPermission(device)
                        if(permitToRead){
                            setUpConnection(device,serviceContext)
                        } else{
                            manager.requestPermission(device, permissionIntent)
                        }
                        deviceConnectionStatus = 1
                    } else if((device != null) &&(device.deviceClass == 0)){ // USB_CLASS_PER_INTERFACE - USB STICK
                       
                    }
                }
            } else (deviceList.size == 0){
                connectionStatus = 0
                }
            }

测试 class

class 测试 {

val mockContext = ApplicationProvider.getApplicationContext<Context>()



    @Test
    fun needTobeTested_returnOne(){

    asserThat(sample.needToBeTested(mockContext)==1) //successcase

} }

为了测试这个 class，需要设置deviceList的值。有没有办法从测试 class 中设置“x”的值来测试这个 function。 我是 android 和测试的新手。任何帮助都会非常有帮助。