92 lines
3.1 KiB
Java
92 lines
3.1 KiB
Java
/*
|
|
* Copyright (c) 2023, Oracle and/or its affiliates. All rights reserved.
|
|
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
|
|
*
|
|
* This code is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 only, as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This code is distributed in the hope that it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
* version 2 for more details (a copy is included in the LICENSE file that
|
|
* accompanied this code).
|
|
*
|
|
* You should have received a copy of the GNU General Public License version
|
|
* 2 along with this work; if not, write to the Free Software Foundation,
|
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*
|
|
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
|
|
* or visit www.oracle.com if you need additional information or have any
|
|
* questions.
|
|
*/
|
|
|
|
import java.util.List;
|
|
import java.util.stream.Gatherers;
|
|
import java.util.stream.Stream;
|
|
|
|
import org.junit.jupiter.api.Test;
|
|
import org.junit.jupiter.params.ParameterizedTest;
|
|
import org.junit.jupiter.params.provider.MethodSource;
|
|
import static org.junit.jupiter.api.Assertions.*;
|
|
import static org.junit.jupiter.api.Assumptions.*;
|
|
|
|
/**
|
|
* @test
|
|
* @summary Tests the API and contract of Gatherers.fold
|
|
* @run junit GatherersFoldTest
|
|
*/
|
|
|
|
public class GatherersFoldTest {
|
|
|
|
record Config(int streamSize, boolean parallel) {
|
|
Stream<Integer> stream() {
|
|
var stream = Stream.iterate(1, i -> i + 1).limit(streamSize);
|
|
stream = parallel ? stream.parallel() : stream.sequential();
|
|
return stream;
|
|
}
|
|
}
|
|
|
|
static final Stream<Integer> sizes(){
|
|
return Stream.of(0,1,10,33,99,9999);
|
|
}
|
|
|
|
static final Stream<Config> sequentialAndParallel(int size) {
|
|
return Stream.of(false, true)
|
|
.map(parallel ->
|
|
new Config(size, parallel));
|
|
}
|
|
|
|
static final Stream<Config> configurations() {
|
|
return sizes().flatMap(i -> sequentialAndParallel(i));
|
|
}
|
|
|
|
@Test
|
|
public void throwsNPEWhenStateSupplierIsNull() {
|
|
assertThrows(NullPointerException.class, () -> Gatherers.<String, String>fold(null, (state, next) -> state));
|
|
}
|
|
|
|
@Test
|
|
public void throwsNPEWhenFolderFunctionIsNull() {
|
|
assertThrows(NullPointerException.class, () -> Gatherers.<String, String>fold(() -> "", null));
|
|
}
|
|
|
|
@ParameterizedTest
|
|
@MethodSource("configurations")
|
|
public void behavesAsExpected(Config config) {
|
|
final var expectedResult = List.of(
|
|
config.stream()
|
|
.sequential()
|
|
.reduce(0L, (acc, next) -> acc + next,(l, r) -> {
|
|
throw new IllegalStateException();
|
|
})
|
|
);
|
|
|
|
final var result = config.stream()
|
|
.gather(Gatherers.fold(() -> 0L, (acc, next) -> acc + next))
|
|
.toList();
|
|
|
|
assertEquals(expectedResult, result);
|
|
}
|
|
}
|