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