代码如下，下面代码 6.0 以上系统抛出权限错误，需要动态权限申请，此时应该怎么在这个单元测试中申请权限？

package com.reizx.ares.rbl;

import android.Manifest;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.Instrumentation;
import android.support.test.rule.ActivityTestRule;
import android.support.test.rule.GrantPermissionRule;
import android.support.test.runner.AndroidJUnit4;
import android.util.Log;

import com.blankj.utilcode.util.PhoneUtils;
import com.blankj.utilcode.util.ShellUtils;
import com.reizx.ares.rbl.util.RblLogUtil;
import com.tbruyelle.rxpermissions2.Permission;
import com.tbruyelle.rxpermissions2.RxPermissions;

import org.junit.Rule;
import org.junit.Test;
import org.junit.runner.RunWith;

import io.reactivex.functions.Consumer;

/**
 * 一个单元测试的模版用例，用于直接复制改名生成单元测试
 */

@RunWith(AndroidJUnit4.class)
public class PermissionTest extends BaseTest{

//无效
//    @Rule
//    public ActivityTestRule<RblActivity> mActivityTestRule = new ActivityTestRule<>(RblActivity.class);
//    @Rule
//    public GrantPermissionRule readPermissionRule = GrantPermissionRule.grant(Manifest.permission.READ_EXTERNAL_STORAGE);
//    @Rule
//    public GrantPermissionRule writePermissionRule = GrantPermissionRule.grant(Manifest.permission.WRITE_EXTERNAL_STORAGE);
//    @Rule
//    public GrantPermissionRule statusPermissionRule = GrantPermissionRule.grant(Manifest.permission.READ_PHONE_STATE);

    @Test
    public void templateTest(){
        //todo 在下面写测试用例
        try {
            Log.d("PermissionTest", "package name : " + app.getPackageName());
            String cmds = "pm grant " + app.getPackageName() + " android.permission.READ_PHONE_STATE";
            ShellUtils.execCmd(cmds, false);//无效
            GrantPermissionRule.grant("android.permission.READ_PHONE_STATE");// 无效
            String deviceId = PhoneUtils.getDeviceId(); //此处抛出没有权限ID
            Log.d("PermissionTest", "get deviceId : " + deviceId);
        }catch (Exception e){
            Log.d("PermissionTest", "get deviceId faield, error : " + e);
        }
    }