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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 com.google.common.truth.Truth.assertThat;
import android.support.test.filters.SmallTest;
import android.support.test.runner.AndroidJUnit4;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import org.junit.Test;
import org.junit.runner.RunWith;
/** Unit tests for {@link RecentChannelEvaluator}. */
@SmallTest
@RunWith(AndroidJUnit4.class)
public class RecentChannelEvaluatorTest extends EvaluatorTestCase<RecentChannelEvaluator> {
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 RecentChannelEvaluator createEvaluator() {
return new RecentChannelEvaluator();
}
@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);
// Every channel has one watch log with 1 hour. Also, for two channels
// which has ID x and y (x < y), the channel y is watched later than the channel x.
long latestWatchEndTimeMs = System.currentTimeMillis() - TimeUnit.DAYS.toMillis(2);
List<Long> channelIdList = getChannelIdListSorted();
for (long channelId : channelIdList) {
addWatchLog(channelId, latestWatchEndTimeMs, TimeUnit.HOURS.toMillis(1));
latestWatchEndTimeMs += TimeUnit.HOURS.toMillis(1);
}
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);
assertThat(previousScore).isAtMost(score);
previousScore = score;
}
}
@Test
public void testScoreIncreasesWithNewWatchLog() {
addChannels(DEFAULT_NUMBER_OF_CHANNELS);
addRandomWatchLogs(
DEFAULT_WATCH_START_TIME_MS,
DEFAULT_WATCH_END_TIME_MS,
DEFAULT_MAX_WATCH_DURATION_MS);
notifyChannelAndWatchLogLoaded();
List<Long> channelIdList = getChannelIdListSorted();
long latestWatchEndTimeMs = getLatestWatchEndTimeMs();
for (long channelId : channelIdList) {
double previousScore = mEvaluator.evaluateChannel(channelId);
long durationMs = TimeUnit.MINUTES.toMillis(10);
addWatchLog(channelId, latestWatchEndTimeMs, durationMs);
latestWatchEndTimeMs += durationMs;
// Score must be increased because recentness of the log increases.
assertThat(previousScore).isAtMost(mEvaluator.evaluateChannel(channelId));
}
}
@Test
public void testScoreDecreasesWithIncrementOfWatchedLogUpdatedTime() {
addChannels(DEFAULT_NUMBER_OF_CHANNELS);
addRandomWatchLogs(
DEFAULT_WATCH_START_TIME_MS,
DEFAULT_WATCH_END_TIME_MS,
DEFAULT_MAX_WATCH_DURATION_MS);
notifyChannelAndWatchLogLoaded();
Map<Long, Double> scores = new HashMap<>();
List<Long> channelIdList = getChannelIdListSorted();
long latestWatchedEndTimeMs = getLatestWatchEndTimeMs();
for (long channelId : channelIdList) {
scores.put(channelId, mEvaluator.evaluateChannel(channelId));
}
long newChannelId = addChannel().getId();
addWatchLog(newChannelId, latestWatchedEndTimeMs, TimeUnit.MINUTES.toMillis(10));
for (long channelId : channelIdList) {
// Score must be decreased because LastWatchLogUpdateTime increases by new log.
assertThat(mEvaluator.evaluateChannel(channelId)).isAtMost(scores.get(channelId));
}
}
}
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