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23 package org.openjdk.tests.java.util.stream;
24 
25 import java.util.stream.IntStream;
26 import java.util.stream.IntStreamTestDataProvider;
27 import java.util.stream.OpTestCase;
28 import org.testng.annotations.Test;
29 
30 import java.util.Arrays;
31 import java.util.OptionalInt;
32 import java.util.stream.TestData;
33 
34 import static java.util.stream.LambdaTestHelpers.*;
35 
36 public class IntReduceTest extends OpTestCase {
testReduce()37     public void testReduce() {
38         int[] a = IntStream.range(1, 11).toArray();
39 
40         assertEquals(55, Arrays.stream(a).reduce(irPlus).getAsInt());
41         assertEquals(55, Arrays.stream(a).reduce(0, irPlus));
42         assertEquals(10, Arrays.stream(a).reduce(irMax).getAsInt());
43         assertEquals(1, Arrays.stream(a).reduce(irMin).getAsInt());
44 
45         assertEquals(0, IntStream.empty().reduce(0, irPlus));
46         assertFalse(IntStream.empty().reduce(irPlus).isPresent());
47 
48         assertEquals(110, Arrays.stream(a).map(irDoubler).reduce(irPlus).getAsInt());
49         assertEquals(20, Arrays.stream(a).map(irDoubler).reduce(irMax).getAsInt());
50         assertEquals(2, Arrays.stream(a).map(irDoubler).reduce(irMin).getAsInt());
51     }
52 
53     @Test(dataProvider = "IntStreamTestData", dataProviderClass = IntStreamTestDataProvider.class)
testOps(String name, TestData.OfInt data)54     public void testOps(String name, TestData.OfInt data) {
55         assertEquals(0, (int) exerciseTerminalOps(data, s -> s.filter(ipFalse), s -> s.reduce(0, irPlus)));
56 
57         OptionalInt seedless = exerciseTerminalOps(data, s -> s.reduce(irPlus));
58         int folded = exerciseTerminalOps(data, s -> s.reduce(0, irPlus));
59         assertEquals(folded, seedless.orElse(0));
60 
61         seedless = exerciseTerminalOps(data, s -> s.reduce(irMin));
62         folded = exerciseTerminalOps(data, s -> s.reduce(Integer.MAX_VALUE, irMin));
63         assertEquals(folded, seedless.orElse(Integer.MAX_VALUE));
64 
65         seedless = exerciseTerminalOps(data, s -> s.reduce(irMax));
66         folded = exerciseTerminalOps(data, s -> s.reduce(Integer.MIN_VALUE, irMax));
67         assertEquals(folded, seedless.orElse(Integer.MIN_VALUE));
68 
69         seedless = exerciseTerminalOps(data, s -> s.map(irDoubler), s -> s.reduce(irPlus));
70         folded = exerciseTerminalOps(data, s -> s.map(irDoubler), s -> s.reduce(0, irPlus));
71         assertEquals(folded, seedless.orElse(0));
72 
73         seedless = exerciseTerminalOps(data, s -> s.map(irDoubler), s -> s.reduce(irMin));
74         folded = exerciseTerminalOps(data, s -> s.map(irDoubler), s -> s.reduce(Integer.MAX_VALUE, irMin));
75         assertEquals(folded, seedless.orElse(Integer.MAX_VALUE));
76 
77         seedless = exerciseTerminalOps(data, s -> s.map(irDoubler), s -> s.reduce(irMax));
78         folded = exerciseTerminalOps(data, s -> s.map(irDoubler), s -> s.reduce(Integer.MIN_VALUE, irMax));
79         assertEquals(folded, seedless.orElse(Integer.MIN_VALUE));
80     }
81 }
82