ojluni/src/test/java/util/stream/test/org/openjdk/tests/java/util/stream/LongPrimitiveOpsTests.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * version 2 for more details (a copy is included in the LICENSE file that
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 *
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package org.openjdk.tests.java.util.stream;

import org.testng.Assert;
import org.testng.annotations.Test;

import java.util.Arrays;
import java.util.List;
import java.util.Random;
import java.util.concurrent.atomic.AtomicLong;
import java.util.function.LongConsumer;
import java.util.stream.Collectors;
import java.util.stream.LongStream;

import static org.testng.Assert.assertEquals;

@Test
public class LongPrimitiveOpsTests {

    public void testSum() {
        long sum = LongStream.range(1, 10).filter(i -> i % 2 == 0).sum();
        assertEquals(sum, 20);
    }

    public void testMap() {
        long sum = LongStream.range(1, 10).filter(i -> i % 2 == 0).map(i -> i * 2).sum();
        assertEquals(sum, 40);
    }

    public void testParSum() {
        long sum = LongStream.range(1, 10).parallel().filter(i -> i % 2 == 0).sum();
        assertEquals(sum, 20);
    }

    @Test(groups = { "serialization-hostile" })
    public void testTee() {
        long[] teeSum = new long[1];
        long sum = LongStream.range(1, 10).filter(i -> i % 2 == 0).peek(i -> { teeSum[0] = teeSum[0] + i; }).sum();
        assertEquals(teeSum[0], sum);
    }

    @Test(groups = { "serialization-hostile" })
    public void testForEach() {
        long[] sum = new long[1];
        LongStream.range(1, 10).filter(i -> i % 2 == 0).forEach(i -> { sum[0] = sum[0] + i; });
        assertEquals(sum[0], 20);
    }

    @Test(groups = { "serialization-hostile" })
    public void testParForEach() {
        AtomicLong ai = new AtomicLong(0);
        LongStream.range(1, 10).parallel().filter(i -> i % 2 == 0).forEach(ai::addAndGet);
        assertEquals(ai.get(), 20);
    }

    public void testBox() {
        List<Long> l = LongStream.range(1, 10).parallel().boxed().collect(Collectors.toList());
        long sum = l.stream().reduce(0L, (a, b) -> a + b);
        assertEquals(sum, 45);
    }

    public void testUnBox() {
        long sum = Arrays.asList(1L, 2L, 3L, 4L, 5L).stream().mapToLong(i -> (long) i).sum();
        assertEquals(sum, 15);
    }

    public void testToArray() {
        {
            long[] array =  LongStream.range(1, 10).map(i -> i * 2).toArray();
            assertEquals(array, new long[]{2, 4, 6, 8, 10, 12, 14, 16, 18});
        }

        {
            long[] array =  LongStream.range(1, 10).parallel().map(i -> i * 2).toArray();
            assertEquals(array, new long[]{2, 4, 6, 8, 10, 12, 14, 16, 18});
        }
    }

    public void testSort() {
        Random r = new Random();

        long[] content = LongStream.generate(() -> r.nextLong()).limit(10).toArray();
        long[] sortedContent = content.clone();
        Arrays.sort(sortedContent);

        {
            long[] array =  Arrays.stream(content).sorted().toArray();
            assertEquals(array, sortedContent);
        }

        {
            long[] array =  Arrays.stream(content).parallel().sorted().toArray();
            assertEquals(array, sortedContent);
        }
    }

    public void testSortSort() {
        Random r = new Random();

        long[] content = LongStream.generate(() -> r.nextLong()).limit(10).toArray();
        long[] sortedContent = content.clone();
        Arrays.sort(sortedContent);

        {
            long[] array =  Arrays.stream(content).sorted().sorted().toArray();
            assertEquals(array, sortedContent);
        }

        {
            long[] array =  Arrays.stream(content).parallel().sorted().sorted().toArray();
            assertEquals(array, sortedContent);
        }
    }

    public void testSequential() {

        long[] expected = LongStream.range(1, 1000).toArray();

        class AssertingConsumer implements LongConsumer {
            private final long[] array;
            int offset;

            AssertingConsumer(long[] array) {
                this.array = array;
            }

            @Override
            public void accept(long value) {
                assertEquals(array[offset++], value);
            }

            public int getCount() { return offset; }
        }

        {
            AssertingConsumer consumer = new AssertingConsumer(expected);
            LongStream.range(1, 1000).sequential().forEach(consumer);
            assertEquals(expected.length, consumer.getCount());
        }

        {
            AssertingConsumer consumer = new AssertingConsumer(expected);
            LongStream.range(1, 1000).parallel().sequential().forEach(consumer);
            assertEquals(expected.length, consumer.getCount());
        }
    }

    public void testLimit() {
        long[] expected = LongStream.range(1, 10).toArray();

        {
            long[] actual = LongStream.iterate(1, i -> i + 1).limit(9).toArray();
            Assert.assertTrue(Arrays.equals(expected, actual));
        }

        {
            long[] actual = LongStream.range(1, 100).parallel().limit(9).toArray();
            Assert.assertTrue(Arrays.equals(expected, actual));
        }
    }

}