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23 package org.openjdk.tests.java.util.stream;
24 
25 import org.testng.Assert;
26 import org.testng.annotations.Test;
27 
28 import java.util.Arrays;
29 import java.util.Random;
30 import java.util.Spliterator;
31 import java.util.stream.DoubleStream;
32 import java.util.stream.LongStream;
33 
34 import static org.testng.Assert.assertEquals;
35 
36 import static org.testng.Assert.assertFalse;
37 import static org.testng.Assert.assertTrue;
38 
39 /**
40  * @test
41  * @bug 8153293
42  */
43 @Test
44 public class DoublePrimitiveOpsTests {
45 
46     // @@@ tests for double are fragile if relying on equality when accumulating and multiplying values
47 
testUnBox()48     public void testUnBox() {
49         double sum = Arrays.asList(1.0, 2.0, 3.0, 4.0, 5.0).stream().mapToDouble(i -> i).reduce(0.0, Double::sum);
50         assertEquals(sum, 1.0 + 2.0 + 3.0 + 4.0 + 5.0);
51     }
52 
testFlags()53     public void testFlags() {
54         assertTrue(LongStream.range(1, 10).asDoubleStream().boxed().spliterator()
55                       .hasCharacteristics(Spliterator.SORTED));
56         assertFalse(DoubleStream.of(1, 10).boxed().spliterator()
57                       .hasCharacteristics(Spliterator.SORTED));
58     }
59 
testToArray()60     public void testToArray() {
61         {
62             double[] array =  LongStream.range(1, 10).asDoubleStream().map(i -> i * 2).toArray();
63             assertEquals(array, new double[]{2, 4, 6, 8, 10, 12, 14, 16, 18});
64         }
65 
66         {
67             double[] array =  LongStream.range(1, 10).parallel().asDoubleStream().map(i -> i * 2).toArray();
68             assertEquals(array, new double[]{2, 4, 6, 8, 10, 12, 14, 16, 18});
69         }
70     }
71 
testSort()72     public void testSort() {
73         Random r = new Random();
74 
75         double[] content = DoubleStream.generate(() -> r.nextDouble()).limit(10).toArray();
76         double[] sortedContent = content.clone();
77         Arrays.sort(sortedContent);
78 
79         {
80             double[] array =  Arrays.stream(content).sorted().toArray();
81             assertEquals(array, sortedContent);
82         }
83 
84         {
85             double[] array =  Arrays.stream(content).parallel().sorted().toArray();
86             assertEquals(array, sortedContent);
87         }
88     }
89 
testSortDistinct()90     public void testSortDistinct() {
91         {
92             double[] range = LongStream.range(0, 10).asDoubleStream().toArray();
93 
94             assertEquals(LongStream.range(0, 10).asDoubleStream().sorted().distinct().toArray(), range);
95             assertEquals(LongStream.range(0, 10).asDoubleStream().parallel().sorted().distinct().toArray(), range);
96 
97             double[] data = {5, 3, 1, 1, 5, Double.NaN, 3, 9, Double.POSITIVE_INFINITY,
98                              Double.NEGATIVE_INFINITY, 2, 9, 1, 0, 8, Double.NaN, -0.0};
99             double[] expected = {Double.NEGATIVE_INFINITY, -0.0, 0, 1, 2, 3, 5, 8, 9,
100                                  Double.POSITIVE_INFINITY, Double.NaN};
101             assertEquals(DoubleStream.of(data).sorted().distinct().toArray(), expected);
102             assertEquals(DoubleStream.of(data).parallel().sorted().distinct().toArray(), expected);
103         }
104     }
105 
testSortSort()106     public void testSortSort() {
107         Random r = new Random();
108 
109         double[] content = DoubleStream.generate(() -> r.nextDouble()).limit(10).toArray();
110         double[] sortedContent = content.clone();
111         Arrays.sort(sortedContent);
112 
113         {
114             double[] array =  Arrays.stream(content).sorted().sorted().toArray();
115             assertEquals(array, sortedContent);
116         }
117 
118         {
119             double[] array =  Arrays.stream(content).parallel().sorted().sorted().toArray();
120             assertEquals(array, sortedContent);
121         }
122     }
123 
testLimit()124     public void testLimit() {
125         double[] expected = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
126 
127         {
128             double[] actual = DoubleStream.iterate(1.0, i -> i + 1.0).limit(9).toArray();
129             Assert.assertTrue(Arrays.equals(expected, actual));
130         }
131 
132         {
133             double[] actual = LongStream.range(1, 100).parallel().asDoubleStream().limit(9).toArray();
134             Assert.assertTrue(Arrays.equals(expected, actual));
135         }
136     }
137 }
138