Add ImsConfigImplBase test to ensure caching works properly

/*

 * 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.telephony.ims;

import static org.junit.Assert.assertEquals;

import static org.junit.Assert.assertFalse;

import static org.junit.Assert.assertNotNull;

import android.telephony.ims.aidl.IImsConfig;

import android.telephony.ims.aidl.IImsConfigCallback;

import android.telephony.ims.stub.ImsConfigImplBase;

import android.util.Pair;

import androidx.test.runner.AndroidJUnit4;

import org.junit.After;

import org.junit.Before;

import org.junit.Test;

import org.junit.runner.RunWith;

import java.util.concurrent.LinkedBlockingQueue;

@RunWith(AndroidJUnit4.class)

public class ImsConfigImplTest {

    private static final int TEST_KEY = 1;

    private static final int TEST_INT_VALUE = 2;

    private static final String TEST_STRING_VALUE = "abc";

    private static class ImsConfigImpl extends ImsConfigImplBase {

        public Pair<Integer, Integer> latestIntConfig;

        public Pair<Integer, String> latestStringConfig;

        // for testing caching

        private boolean mIsGetConfigCalled = false;

        @Override

        public int setConfig(int item, int value) {

            latestIntConfig = new Pair<>(item, value);

            return CONFIG_RESULT_SUCCESS;

        }

        @Override

        public int setConfig(int item, String value) {

            latestStringConfig = new Pair<>(item, value);

            return CONFIG_RESULT_SUCCESS;

        }

        @Override

        public int getConfigInt(int item) {

            mIsGetConfigCalled = true;

            if (latestIntConfig == null) {

                return CONFIG_RESULT_UNKNOWN;

            }

            if (latestIntConfig.first == item) {

                return latestIntConfig.second;

            }

            return CONFIG_RESULT_UNKNOWN;

        }

        @Override

        public String getConfigString(int item) {

            mIsGetConfigCalled = true;

            if (latestStringConfig == null) {

                return null;

            }

            if (latestStringConfig.first == item) {

                return latestStringConfig.second;

            }

            return null;

        }

        public boolean getIsGetConfigCalledAndReset() {

            boolean result = mIsGetConfigCalled;

            mIsGetConfigCalled = false;

            return result;

        }

    }

    private ImsConfigImpl mConfigUT;

    private IImsConfig mConfigBinder;

    @Before

    public void setUp() throws Exception {

        mConfigUT = new ImsConfigImpl();

        mConfigBinder = mConfigUT.getIImsConfig();

    }

    @After

    public void tearDown() {

        mConfigUT = null;

        mConfigBinder = null;

    }

    @Test

    public void testIntCaching() throws Exception {

        final LinkedBlockingQueue<Pair<Integer, Integer>> mConfigChanges =

                new LinkedBlockingQueue<>();

        final IImsConfigCallback mConfigCallback = new IImsConfigCallback.Stub() {

            @Override

            public void onIntConfigChanged(int item, int value) {

                mConfigChanges.offer(new Pair<>(item, value));

            }

            @Override

            public void onStringConfigChanged(int item, String value) {}

        };

        mConfigBinder.addImsConfigCallback(mConfigCallback);

        mConfigBinder.setConfigInt(TEST_KEY, TEST_INT_VALUE);

        // verify callback is called properly

        Pair<Integer, Integer> callbackResult = mConfigChanges.poll();

        assertNotNull(callbackResult);

        assertEquals(TEST_KEY, callbackResult.first.intValue());

        assertEquals(TEST_INT_VALUE, callbackResult.second.intValue());

        // verify set is called on Impl

        assertNotNull(mConfigUT.latestIntConfig);

        assertEquals(TEST_KEY, mConfigUT.latestIntConfig.first.intValue());

        assertEquals(TEST_INT_VALUE, mConfigUT.latestIntConfig.second.intValue());

        // Now get the test key, this impl should not be called, as it is cached internally.

        assertEquals(TEST_INT_VALUE, mConfigBinder.getConfigInt(TEST_KEY));

        assertFalse(mConfigUT.getIsGetConfigCalledAndReset());

    }

    @Test

    public void testStringCaching() throws Exception {

        final LinkedBlockingQueue<Pair<Integer, String>> mConfigChanges =

                new LinkedBlockingQueue<>();

        final IImsConfigCallback mConfigCallback = new IImsConfigCallback.Stub() {

            @Override

            public void onIntConfigChanged(int item, int value) {}

            @Override

            public void onStringConfigChanged(int item, String value) {

                mConfigChanges.offer(new Pair<>(item, value));

            }

        };

        mConfigBinder.addImsConfigCallback(mConfigCallback);

        mConfigBinder.setConfigString(TEST_KEY, TEST_STRING_VALUE);

        // verify callback is called properly

        Pair<Integer, String> callbackResult = mConfigChanges.poll();

        assertNotNull(callbackResult);

        assertEquals(TEST_KEY, callbackResult.first.intValue());

        assertEquals(TEST_STRING_VALUE, callbackResult.second);

        // verify set is called on Impl

        assertNotNull(mConfigUT.latestStringConfig);

        assertEquals(TEST_KEY, mConfigUT.latestStringConfig.first.intValue());

        assertEquals(TEST_STRING_VALUE, mConfigUT.latestStringConfig.second);

        // Now get the test key, this impl should not be called, as it is cached internally.

        assertEquals(TEST_STRING_VALUE, mConfigBinder.getConfigString(TEST_KEY));

        assertFalse(mConfigUT.getIsGetConfigCalledAndReset());

    }

}