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// Copyright 2018 The Bazel Authors. 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;
import static com.google.common.truth.Truth.assertThat;
import com.google.common.collect.ImmutableList;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
import java.util.stream.Stream;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/** Tests for {@link Extrema}. */
@RunWith(JUnit4.class)
public class ExtremaTest {
@Test
public void handlesDupes() {
Extrema<Integer> extrema = Extrema.min(3);
extrema.aggregate(4);
extrema.aggregate(3);
extrema.aggregate(1);
extrema.aggregate(2);
extrema.aggregate(1);
extrema.aggregate(3);
extrema.aggregate(1);
assertThat(extrema.getExtremeElements()).containsExactly(1, 1, 1);
}
@Test
public void minExtremaSmallK() {
runRangeTest(Extrema.min(5), 1, 100, ImmutableList.of(1, 2, 3, 4, 5));
}
@Test
public void minExtremaLargeK() {
runRangeTest(Extrema.min(10), 1, 5, ImmutableList.of(1, 2, 3, 4, 5));
}
@Test
public void maxExtremaSmallK() {
runRangeTest(Extrema.max(5), 1, 100, ImmutableList.of(100, 99, 98, 97, 96));
}
@Test
public void maxExtremaLargeK() {
runRangeTest(Extrema.max(10), 1, 5, ImmutableList.of(5, 4, 3, 2, 1));
}
private void runRangeTest(
Extrema<Integer> extrema,
int leftEndpointInclusive,
int rightEndpointInclusive,
ImmutableList<Integer> expected) {
assertThat(extrema.getExtremeElements()).isEmpty();
closedRangeShuffled(leftEndpointInclusive, rightEndpointInclusive).forEach(extrema::aggregate);
assertThat(extrema.getExtremeElements()).containsExactlyElementsIn(expected).inOrder();
extrema.clear();
assertThat(extrema.getExtremeElements()).isEmpty();
}
private static Stream<Integer> closedRangeShuffled(
int leftEndpointInclusive, int rightEndpointInclusive) {
List<Integer> list =
IntStream.rangeClosed(leftEndpointInclusive, rightEndpointInclusive).boxed().collect(
Collectors.toList());
Collections.shuffle(list);
return list.stream();
}
}
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