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/*
* Copyright (C) 2015 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.tv.recommendation;
import static org.junit.Assert.assertTrue;
import android.support.test.filters.SmallTest;
import org.junit.Test;
import java.util.List;
import java.util.concurrent.TimeUnit;
/**
* Unit tests for {@link FavoriteChannelEvaluator}.
*/
@SmallTest
public class FavoriteChannelEvaluatorTest extends EvaluatorTestCase<FavoriteChannelEvaluator> {
private static final int DEFAULT_NUMBER_OF_CHANNELS = 4;
private static final long DEFAULT_WATCH_START_TIME_MS =
System.currentTimeMillis() - TimeUnit.DAYS.toMillis(2);
private static final long DEFAULT_WATCH_END_TIME_MS =
System.currentTimeMillis() - TimeUnit.DAYS.toMillis(1);
private static final long DEFAULT_MAX_WATCH_DURATION_MS = TimeUnit.HOURS.toMillis(1);
@Override
public FavoriteChannelEvaluator createEvaluator() {
return new FavoriteChannelEvaluator();
}
@Test
public void testOneChannelWithNoWatchLog() {
long channelId = addChannel().getId();
notifyChannelAndWatchLogLoaded();
assertEqualScores(Recommender.Evaluator.NOT_RECOMMENDED,
mEvaluator.evaluateChannel(channelId));
}
@Test
public void testOneChannelWithRandomWatchLogs() {
addChannel();
addRandomWatchLogs(DEFAULT_WATCH_START_TIME_MS, DEFAULT_WATCH_END_TIME_MS,
DEFAULT_MAX_WATCH_DURATION_MS);
notifyChannelAndWatchLogLoaded();
assertChannelScoresValid();
}
@Test
public void testMultiChannelsWithNoWatchLog() {
addChannels(DEFAULT_NUMBER_OF_CHANNELS);
notifyChannelAndWatchLogLoaded();
List<Long> channelIdList = getChannelIdListSorted();
for (long channelId : channelIdList) {
assertEqualScores(Recommender.Evaluator.NOT_RECOMMENDED,
mEvaluator.evaluateChannel(channelId));
}
}
@Test
public void testMultiChannelsWithRandomWatchLogs() {
addChannels(DEFAULT_NUMBER_OF_CHANNELS);
addRandomWatchLogs(DEFAULT_WATCH_START_TIME_MS, DEFAULT_WATCH_END_TIME_MS,
DEFAULT_MAX_WATCH_DURATION_MS);
notifyChannelAndWatchLogLoaded();
assertChannelScoresValid();
}
@Test
public void testMultiChannelsWithSimpleWatchLogs() {
addChannels(DEFAULT_NUMBER_OF_CHANNELS);
// For two channels which has ID x and y (x < y), the channel y is more watched
// than the channel x. (Duration is longer than channel x)
long latestWatchEndTimeMs = System.currentTimeMillis() - TimeUnit.DAYS.toMillis(2);
long durationMs = 0;
List<Long> channelIdList = getChannelIdListSorted();
for (long channelId : channelIdList) {
durationMs += TimeUnit.MINUTES.toMillis(30);
addWatchLog(channelId, latestWatchEndTimeMs, durationMs);
latestWatchEndTimeMs += durationMs;
}
notifyChannelAndWatchLogLoaded();
assertChannelScoresValid();
// Channel score must be increased as channel ID increased.
double previousScore = Recommender.Evaluator.NOT_RECOMMENDED;
for (long channelId : channelIdList) {
double score = mEvaluator.evaluateChannel(channelId);
assertTrue(previousScore <= score);
previousScore = score;
}
}
@Test
public void testTwoChannelsWithSameWatchDuration() {
long channelOne = addChannel().getId();
long channelTwo = addChannel().getId();
addWatchLog(channelOne, System.currentTimeMillis() - TimeUnit.HOURS.toMillis(1),
TimeUnit.MINUTES.toMillis(30));
addWatchLog(channelTwo, System.currentTimeMillis() - TimeUnit.MINUTES.toMillis(30),
TimeUnit.MINUTES.toMillis(30));
notifyChannelAndWatchLogLoaded();
assertTrue(mEvaluator.evaluateChannel(channelOne) ==
mEvaluator.evaluateChannel(channelTwo));
}
@Test
public void testTwoChannelsWithDifferentWatchDuration() {
long channelOne = addChannel().getId();
long channelTwo = addChannel().getId();
addWatchLog(channelOne, System.currentTimeMillis() - TimeUnit.HOURS.toMillis(3),
TimeUnit.MINUTES.toMillis(30));
addWatchLog(channelTwo, System.currentTimeMillis() - TimeUnit.HOURS.toMillis(2),
TimeUnit.HOURS.toMillis(1));
notifyChannelAndWatchLogLoaded();
// Channel two was watched longer than channel one, so it's score is bigger.
assertTrue(mEvaluator.evaluateChannel(channelOne) < mEvaluator.evaluateChannel(channelTwo));
addWatchLog(channelOne, System.currentTimeMillis() - TimeUnit.HOURS.toMillis(1),
TimeUnit.HOURS.toMillis(1));
// Now, channel one was watched longer than channel two, so it's score is bigger.
assertTrue(mEvaluator.evaluateChannel(channelOne) > mEvaluator.evaluateChannel(channelTwo));
}
@Test
public void testScoreIncreasesWithNewWatchLog() {
long channelId = addChannel().getId();
addRandomWatchLogs(DEFAULT_WATCH_START_TIME_MS, DEFAULT_WATCH_END_TIME_MS,
DEFAULT_MAX_WATCH_DURATION_MS);
notifyChannelAndWatchLogLoaded();
long latestWatchEndTimeMs = getLatestWatchEndTimeMs();
double previousScore = mEvaluator.evaluateChannel(channelId);
addWatchLog(channelId, latestWatchEndTimeMs, TimeUnit.MINUTES.toMillis(10));
// Score must be increased because total watch duration of the channel increases.
assertTrue(previousScore <= mEvaluator.evaluateChannel(channelId));
}
}
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