tests/carservice_unit_test/src/android/car/BinderInterfaceContainerTest.java

/*
 * 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 android.car;

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

import android.os.IBinder;
import android.os.IInterface;

import androidx.test.ext.junit.runners.AndroidJUnit4;

import com.android.car.BinderInterfaceContainer;
import com.android.car.BinderInterfaceContainer.BinderInterface;

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

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

@RunWith(AndroidJUnit4.class)
public final class BinderInterfaceContainerTest {
    @Test
    public void getInterfaces_returnsCopy() {
        BinderInterfaceContainer<IInterface> container = new BinderInterfaceContainer<>();
        TestBinderInterface interfaceOne = new TestBinderInterface();
        container.addBinder(interfaceOne);

        Collection<BinderInterface<IInterface>> interfaces = container.getInterfaces();

        TestBinderInterface interfaceTwo = new TestBinderInterface();
        container.addBinder(interfaceTwo);

        assertThat(interfaces).hasSize(1);
        List<BinderInterface<IInterface>> interfaceList = new ArrayList<>(interfaces);
        assertThat(interfaceList.get(0).binderInterface).isEqualTo(interfaceOne);

        assertThat(container.getInterfaces()).hasSize(2);
    }

    private final class TestBinderInterface extends android.os.Binder implements IInterface {
        @Override
        public IBinder asBinder() {
            return this;
        }
    }
}