Refactor HandlerInjector to SettingsLib

/*

 * Copyright (C) 2021 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.android.settingslib.utils;

import android.os.Handler;

/**

 * Wrapper the {@link android.os.Handler} for testing compatibility.

 */

public class HandlerInjector {

    protected final Handler mHandler;

    public HandlerInjector(Handler handler) {

        mHandler = handler;

    }

    /**  Wrapper the {@link android.os.Handler#postDelayed} for testing compatibility. */

    public void postDelayed(Runnable runnable, long delayMillis) {

        mHandler.postDelayed(runnable, delayMillis);

    }

    /**  Wrapper the {@link android.os.Handler#removeCallbacks} for testing compatibility. */

    public void removeCallbacks(Runnable runnable) {

        mHandler.removeCallbacks(runnable);

    }

}

/*

 * Copyright (C) 2021 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.android.settingslib.utils;

import static org.mockito.Mockito.verify;

import android.os.Handler;

import org.junit.Before;

import org.junit.Rule;

import org.junit.Test;

import org.junit.runner.RunWith;

import org.mockito.Mock;

import org.mockito.junit.MockitoJUnit;

import org.mockito.junit.MockitoRule;

import org.robolectric.RobolectricTestRunner;

@RunWith(RobolectricTestRunner.class)

public class HandlerInjectorTest {

    public static final long TEST_DELAY_MILLIS = 0L;

    @Rule

    public final MockitoRule mMockitoRule = MockitoJUnit.rule();

    @Mock

    public Handler mHandler;

    @Mock

    public Runnable mRunnable;

    private HandlerInjector mHandlerInjector;

    @Before

    public void setUp() {

        mHandlerInjector = new HandlerInjector(mHandler);

    }

    @Test

    public void postDelayed_doByMainThreadHandler() {

        mHandlerInjector.postDelayed(mRunnable, TEST_DELAY_MILLIS);

        verify(mHandler).postDelayed(mRunnable, TEST_DELAY_MILLIS);

    }

    @Test

    public void removeCallbacks_doByMainThreadHandler() {

        mHandlerInjector.removeCallbacks(mRunnable);

        verify(mHandler).removeCallbacks(mRunnable);

    }

}