Fix testcase error

import org.junit.After;

import org.junit.Before;

import org.junit.Ignore;

import org.junit.Test;

import org.junit.runner.RunWith;

import org.mockito.MockitoAnnotations;

    }

    @Test

    @Ignore

    public void updateBatteryTipAvailabilityCache_hasImportantTip_shouldReturnTrue() {

        final List<BatteryTip> tips = new ArrayList<>();

        tips.add(new LowBatteryTip(BatteryTip.StateType.INVISIBLE, false, ""));

    }

    @Test

    @Ignore

    @Config(shadows = {

            BatteryFixSliceTest.ShadowEarlyWarningTip.class,

            BatteryFixSliceTest.ShadowSliceBackgroundWorker.class

package com.android.settings.testutils.shadow;

import android.util.Log;

import com.android.settingslib.utils.ThreadUtils;

import org.robolectric.annotation.Implementation;

import org.robolectric.annotation.Implements;

import org.robolectric.annotation.Resetter;

import java.util.concurrent.Callable;

@Implements(ThreadUtils.class)

public class ShadowThreadUtils {

    private static boolean sIsMainThread = true;

    private static final String TAG = "ShadowThreadUtils";

    @Resetter

    public static void reset() {

        runnable.run();

    }

    @Implementation

    protected static void postOnBackgroundThread(Callable callable) {

        try {

            callable.call();

        } catch (Exception e) {

            Log.e(TAG, e.getMessage(), e);

        }

    }

    @Implementation

    protected static void postOnMainThread(Runnable runnable) {

        runnable.run();