Fix crash when running UserSwitcherControllerTest

package com.android.systemui.statusbar.policy

import android.app.IActivityTaskManager

import android.content.Context

import android.content.DialogInterface

import android.content.Intent

import android.content.pm.UserInfo

import android.graphics.Bitmap

import android.hardware.face.FaceManager

import android.hardware.fingerprint.FingerprintManager

import android.os.Handler

import android.os.UserManager

import android.testing.AndroidTestingRunner

import org.mockito.Mock

import org.mockito.Mockito.any

import org.mockito.Mockito.anyString

import org.mockito.Mockito.mock

import org.mockito.Mockito.`when`

import org.mockito.MockitoAnnotations

        testableLooper = TestableLooper.get(this)

        uiEventLogger = UiEventLoggerFake()

        mContext.addMockSystemService(Context.FACE_SERVICE, mock(FaceManager::class.java))

        mContext.addMockSystemService(Context.FINGERPRINT_SERVICE,

                mock(FingerprintManager::class.java))

        userSwitcherController = UserSwitcherController(context,

                userManager,

                userTracker,

        `when`(userManager.createGuest(any(), anyString())).thenReturn(userInfo)

        userSwitcherController.onUserListItemClicked(emptyGuestUserRecord)

        testableLooper.processAllMessages()

        assertEquals(1, uiEventLogger.numLogs())

        assertEquals(QSUserSwitcherEvent.QS_USER_GUEST_ADD.id, uiEventLogger.eventId(0))

    }