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// Copyright 2014 Google Inc. All rights reserved.
//
// 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.google.devtools.build.lib.collect.nestedset;
import static org.junit.Assert.assertEquals;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import junit.framework.TestCase;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Random;
/**
* Tests for {@link RecordingUniqueifier}.
*/
@RunWith(JUnit4.class)
public class RecordingUniqueifierTest extends TestCase {
private static final Random RANDOM = new Random();
private static final int VERY_SMALL = 3; // one byte
private static final int SMALL = 11; // two bytes
private static final int MEDIUM = 18; // three bytes -- unmemoed
// For this one, the "* 8" is a bytes to bits (1 memo is 1 bit)
private static final int LARGE = (RecordingUniqueifier.LENGTH_THRESHOLD * 8) + 3;
private static final int[] SIZES = new int[] {VERY_SMALL, SMALL, MEDIUM, LARGE};
private void doTest(int uniqueInputs, int deterministicHeadSize) throws Exception {
Preconditions.checkArgument(deterministicHeadSize <= uniqueInputs,
"deterministicHeadSize must be smaller than uniqueInputs");
// Setup
List<Integer> inputList = new ArrayList<>(uniqueInputs);
Collection<Integer> inputsDeduped = new LinkedHashSet<>(uniqueInputs);
for (int i = 0; i < deterministicHeadSize; i++) { // deterministic head
inputList.add(i);
inputsDeduped.add(i);
}
while (inputsDeduped.size() < uniqueInputs) { // random selectees
Integer i = RANDOM.nextInt(uniqueInputs);
inputList.add(i);
inputsDeduped.add(i);
}
// Unmemoed run
List<Integer> firstList = new ArrayList<>(uniqueInputs);
RecordingUniqueifier recordingUniqueifier = new RecordingUniqueifier();
for (Integer i : inputList) {
if (recordingUniqueifier.isUnique(i)) {
firstList.add(i);
}
}
// Potentially memo'ed run
List<Integer> secondList = new ArrayList<>(uniqueInputs);
Object memo = recordingUniqueifier.getMemo();
Uniqueifier uniqueifier = RecordingUniqueifier.createReplayUniqueifier(memo);
for (Integer i : inputList) {
if (uniqueifier.isUnique(i)) {
secondList.add(i);
}
}
// Evaluate results
inputsDeduped = ImmutableList.copyOf(inputsDeduped);
assertEquals("Unmemo'ed run has unexpected contents", inputsDeduped, firstList);
assertEquals("Memo'ed run has unexpected contents", inputsDeduped, secondList);
}
private void doTestWithLucidException(int uniqueInputs, int deterministicHeadSize)
throws Exception {
try {
doTest(uniqueInputs, deterministicHeadSize);
} catch (Exception e) {
throw new Exception("Failure in size: " + uniqueInputs, e);
}
}
@Test
public void noInputs() throws Exception {
doTestWithLucidException(0, 0);
}
@Test
public void allUnique() throws Exception {
for (int size : SIZES) {
doTestWithLucidException(size, size);
}
}
@Test
public void fuzzedWithDeterministic2() throws Exception {
// The way that it is used, we know that the first two additions are not equal.
// Optimizations were made for this case in small memos.
for (int size : SIZES) {
doTestWithLucidException(size, 2);
}
}
@Test
public void fuzzedWithDeterministic2_otherSizes() throws Exception {
for (int i = 0; i < 100; i++) {
int size = RANDOM.nextInt(10000) + 2;
doTestWithLucidException(size, 2);
}
}
}
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