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122 changes: 122 additions & 0 deletions guava-tests/test/com/google/common/collect/MoreGatherersTest.java
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Original file line number Diff line number Diff line change
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/*
* Copyright (C) 2026 The Guava Authors
*
* 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.common.collect;

import static com.google.common.collect.MoreGatherers.distinctBy;

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cannot find symbol
import static com.google.common.truth.Truth.assertThat;

import com.google.common.annotations.GwtIncompatible;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.function.Function;
import java.util.stream.Stream;
import org.jspecify.annotations.NullMarked;
import org.jspecify.annotations.Nullable;
import org.junit.Test;

/// Tests for `MoreGatherers`.
@GwtIncompatible
@NullMarked
public class MoreGatherersTest {

@Test
public void testDistinctBy_example() {
ImmutableList<String> input = ImmutableList.of("foo", "bar", "quux", "womble");
List<String> output = input.stream().gather(distinctBy(String::length)).toList();

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assertThat(output).containsExactly("foo", "quux", "womble").inOrder();
}

@Test
public void testDistinctBy_empty() {
List<String> output = Stream.<String>empty().gather(distinctBy(String::length)).toList();

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assertThat(output).isEmpty();
}

@Test
public void testDistinctBy_allDistinct() {
ImmutableList<String> input = ImmutableList.of("a", "bb", "ccc", "dddd");
List<String> output = input.stream().gather(distinctBy(String::length)).toList();

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assertThat(output).containsExactly("a", "bb", "ccc", "dddd").inOrder();
}

@Test
public void testDistinctBy_allSame() {
ImmutableList<String> input = ImmutableList.of("a", "b", "c", "d");
List<String> output = input.stream().gather(distinctBy(String::length)).toList();

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assertThat(output).containsExactly("a");
}

@Test
public void testDistinctBy_identity() {
ImmutableList<String> input = ImmutableList.of("a", "b", "a", "c", "b");
List<String> output = input.stream().gather(distinctBy(Function.identity())).toList();
assertThat(output).containsExactly("a", "b", "c").inOrder();
}

@Test
public void testDistinctBy_nullKeys() {
ImmutableList<String> input = ImmutableList.of("a", "b", "c");
List<String> output = input.stream().gather(distinctBy(s -> null)).toList();
assertThat(output).containsExactly("a");
}

@Test
public void testDistinctBy_customObjects() {
record Item(int key, String value) {}

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';' expected

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not a statement

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';' expected

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records are not supported in -source 8

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'record' may become a restricted type name in a future release and may be unusable for type declarations or as the element type of an array
ImmutableList<Item> input =
ImmutableList.of(
new Item(1, "one-a"),
new Item(2, "two-a"),
new Item(1, "one-b"),
new Item(3, "three-a"),
new Item(2, "two-b"));
List<Item> output = input.stream().gather(distinctBy(Item::key)).toList();
assertThat(output)
.containsExactly(new Item(1, "one-a"), new Item(2, "two-a"), new Item(3, "three-a"))
.inOrder();
}

@Test
public void testDistinctBy_shortCircuit() {
AtomicInteger seenCount = new AtomicInteger();
ImmutableList<String> input = ImmutableList.of("a", "bb", "ccc", "dddd", "eeeee");
List<String> output =
input.stream()
.peek(e -> seenCount.incrementAndGet())
.gather(distinctBy(String::length))
.limit(2)
.toList();
assertThat(output).containsExactly("a", "bb").inOrder();
assertThat(seenCount.get()).isEqualTo(2);
}

@Test
public void testDistinctBy_superTypeFunction() {
ImmutableList<String> input = ImmutableList.of("foo", "bar", "quux", "womble");
List<String> output = input.stream().gather(distinctBy(CharSequence::length)).toList();
assertThat(output).containsExactly("foo", "quux", "womble").inOrder();
}

@Test
public void testDistinctBy_nullElements() {
List<@Nullable String> input = Arrays.asList("foo", null, "bar", null, "quux");
List<@Nullable String> output =
input.stream().gather(distinctBy(s -> s == null ? 0 : s.length())).toList();
assertThat(output).containsExactly("foo", null, "quux").inOrder();
}
}
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