Add test for ExplicitHealthCheckService

/*

 * Copyright (C) 2020 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.server;

import static com.google.common.truth.Truth.assertThat;

import static org.mockito.Mockito.spy;

import android.content.Intent;

import android.os.IBinder;

import android.os.RemoteCallback;

import android.service.watchdog.ExplicitHealthCheckService;

import android.service.watchdog.IExplicitHealthCheckService;

import org.junit.Before;

import org.junit.Test;

import java.util.concurrent.CountDownLatch;

public class ExplicitHealthCheckServiceTest {

    private ExplicitHealthCheckService mExplicitHealthCheckService;

    private static final String PACKAGE_NAME = "com.test.package";

    @Before

    public void setup() throws Exception {

        mExplicitHealthCheckService = spy(ExplicitHealthCheckService.class);

    }

    /**

     * Test to verify that the correct information is sent in the callback when a package has

     * passed an explicit health check.

     */

    @Test

    public void testNotifyHealthCheckPassed() throws Exception {

        IBinder binder = mExplicitHealthCheckService.onBind(new Intent());

        CountDownLatch countDownLatch = new CountDownLatch(1);

        RemoteCallback callback = new RemoteCallback(result -> {

            assertThat(result.get(ExplicitHealthCheckService.EXTRA_HEALTH_CHECK_PASSED_PACKAGE))

                    .isEqualTo(PACKAGE_NAME);

            countDownLatch.countDown();

        });

        IExplicitHealthCheckService.Stub.asInterface(binder).setCallback(callback);

        mExplicitHealthCheckService.notifyHealthCheckPassed(PACKAGE_NAME);

        countDownLatch.await();

    }

}