1 /*
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   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
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  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
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  23 
  24 /* @test
  25  * @summary Basic functional test of OptionalDouble
  26  * @author Mike Duigou
  27  * @run testng BasicDouble
  28  */
  29 
  30 import java.util.NoSuchElementException;
  31 import java.util.OptionalDouble;
  32 import java.util.stream.DoubleStream;
  33 
  34 import static org.testng.Assert.*;
  35 import org.testng.annotations.Test;
  36 
  37 
  38 public class BasicDouble {
  39 
  40     @Test(groups = "unit")
  41     public void testEmpty() {
  42         OptionalDouble empty = OptionalDouble.empty();
  43         OptionalDouble present = OptionalDouble.of(1.0);
  44 
  45         // empty
  46         assertTrue(empty.equals(empty));
  47         assertTrue(empty.equals(OptionalDouble.empty()));
  48         assertTrue(!empty.equals(present));
  49         assertTrue(0 == empty.hashCode());
  50         assertTrue(!empty.toString().isEmpty());
  51         assertTrue(!empty.isPresent());
  52         empty.ifPresent(v -> { fail(); });
  53         assertEquals(2.0, empty.orElse(2.0));
  54         assertEquals(2.0, empty.orElseGet(()-> 2.0));
  55     }
  56 
  57         @Test(expectedExceptions=NoSuchElementException.class)
  58         public void testEmptyGet() {
  59             OptionalDouble empty = OptionalDouble.empty();
  60 
  61             double got = empty.getAsDouble();
  62         }
  63 
  64         @Test(expectedExceptions=NullPointerException.class)
  65         public void testEmptyOrElseGetNull() {
  66             OptionalDouble empty = OptionalDouble.empty();
  67 
  68             double got = empty.orElseGet(null);
  69         }
  70 
  71         @Test(expectedExceptions=NullPointerException.class)
  72         public void testEmptyOrElseThrowNull() throws Throwable {
  73             OptionalDouble empty = OptionalDouble.empty();
  74 
  75             double got = empty.orElseThrow(null);
  76         }
  77 
  78         @Test(expectedExceptions=ObscureException.class)
  79         public void testEmptyOrElseThrow() throws Exception {
  80             OptionalDouble empty = OptionalDouble.empty();
  81 
  82             double got = empty.orElseThrow(ObscureException::new);
  83         }
  84 
  85         @Test(groups = "unit")
  86         public void testPresent() {
  87         OptionalDouble empty = OptionalDouble.empty();
  88         OptionalDouble present = OptionalDouble.of(1.0);
  89 
  90         // present
  91         assertTrue(present.equals(present));
  92         assertFalse(present.equals(OptionalDouble.of(0.0)));
  93         assertTrue(present.equals(OptionalDouble.of(1.0)));
  94         assertTrue(!present.equals(empty));
  95         assertTrue(Double.hashCode(1.0) == present.hashCode());
  96         assertFalse(present.toString().isEmpty());
  97         assertTrue(-1 != present.toString().indexOf(Double.toString(present.getAsDouble()).toString()));
  98         assertEquals(1.0, present.getAsDouble());
  99         try {
 100             present.ifPresent(v -> { throw new ObscureException(); });
 101             fail();
 102         } catch(ObscureException expected) {
 103 
 104         }
 105         assertEquals(1.0, present.orElse(2.0));
 106         assertEquals(1.0, present.orElseGet(null));
 107         assertEquals(1.0, present.orElseGet(()-> 2.0));
 108         assertEquals(1.0, present.orElseGet(()-> 3.0));
 109         assertEquals(1.0, present.<RuntimeException>orElseThrow(null));
 110         assertEquals(1.0, present.<RuntimeException>orElseThrow(ObscureException::new));
 111     }
 112 
 113     @Test(groups = "unit")
 114     public void testStream() {
 115         {
 116             DoubleStream s = OptionalDouble.empty().stream();
 117             assertFalse(s.isParallel());
 118 
 119             double[] es = s.toArray();
 120             assertEquals(es.length, 0);
 121         }
 122 
 123         {
 124             DoubleStream s = OptionalDouble.of(42.0).stream();
 125             assertFalse(s.isParallel());
 126 
 127             double[] es = s.toArray();
 128             assertEquals(es.length, 1);
 129             assertEquals(es[0], 42.0);
 130         }
 131     }
 132 
 133     private static class ObscureException extends RuntimeException {
 134 
 135     }
 136 }