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  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).
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  23 
  24 /* @test
  25  * @bug 8195649
  26  * @summary Basic functional test of OptionalInt
  27  * @author Mike Duigou
  28  * @build ObscureException
  29  * @run testng BasicInt
  30  */
  31 
  32 import java.util.NoSuchElementException;
  33 import java.util.OptionalInt;
  34 import java.util.concurrent.atomic.AtomicBoolean;
  35 
  36 import static org.testng.Assert.*;
  37 import org.testng.annotations.Test;
  38 
  39 public class BasicInt {
  40 
  41     static final int INTVAL = 33_550_336;
  42     static final int UNEXPECTED = 0xCAFEBABE;
  43 
  44     /**
  45      * Checks a block of assertions over an empty OptionalInt.
  46      */
  47     void checkEmpty(OptionalInt empty) {
  48         assertTrue(empty.equals(OptionalInt.empty()));
  49         assertTrue(OptionalInt.empty().equals(empty));
  50         assertFalse(empty.equals(OptionalInt.of(UNEXPECTED)));
  51         assertFalse(OptionalInt.of(UNEXPECTED).equals(empty));
  52         assertFalse(empty.equals("unexpected"));
  53 
  54         assertFalse(empty.isPresent());
  55         assertTrue(empty.isEmpty());
  56         assertEquals(empty.hashCode(), 0);
  57         assertEquals(empty.orElse(UNEXPECTED), UNEXPECTED);
  58         assertEquals(empty.orElseGet(() -> UNEXPECTED), UNEXPECTED);
  59 
  60         assertThrows(NoSuchElementException.class, () -> empty.getAsInt());
  61         assertThrows(NoSuchElementException.class, () -> empty.orElseThrow());
  62         assertThrows(ObscureException.class,       () -> empty.orElseThrow(ObscureException::new));
  63 
  64         var b = new AtomicBoolean();
  65         empty.ifPresent(s -> b.set(true));
  66         assertFalse(b.get());
  67 
  68         var b1 = new AtomicBoolean(false);
  69         var b2 = new AtomicBoolean(false);
  70         empty.ifPresentOrElse(s -> b1.set(true), () -> b2.set(true));
  71         assertFalse(b1.get());
  72         assertTrue(b2.get());
  73 
  74         assertEquals(empty.toString(), "OptionalInt.empty");
  75     }
  76 
  77     /**
  78      * Checks a block of assertions over an OptionalInt that is expected to
  79      * have a particular value present.
  80      */
  81     void checkPresent(OptionalInt opt, int expected) {
  82         assertFalse(opt.equals(OptionalInt.empty()));
  83         assertFalse(OptionalInt.empty().equals(opt));
  84         assertTrue(opt.equals(OptionalInt.of(expected)));
  85         assertTrue(OptionalInt.of(expected).equals(opt));
  86         assertFalse(opt.equals(OptionalInt.of(UNEXPECTED)));
  87         assertFalse(OptionalInt.of(UNEXPECTED).equals(opt));
  88         assertFalse(opt.equals("unexpected"));
  89 
  90         assertTrue(opt.isPresent());
  91         assertFalse(opt.isEmpty());
  92         assertEquals(opt.hashCode(), Integer.hashCode(expected));
  93         assertEquals(opt.orElse(UNEXPECTED), expected);
  94         assertEquals(opt.orElseGet(() -> UNEXPECTED), expected);
  95 
  96         assertEquals(opt.getAsInt(), expected);
  97         assertEquals(opt.orElseThrow(), expected);
  98         assertEquals(opt.orElseThrow(ObscureException::new), expected);
  99 
 100         var b = new AtomicBoolean(false);
 101         opt.ifPresent(s -> b.set(true));
 102         assertTrue(b.get());
 103 
 104         var b1 = new AtomicBoolean(false);
 105         var b2 = new AtomicBoolean(false);
 106         opt.ifPresentOrElse(s -> b1.set(true), () -> b2.set(true));
 107         assertTrue(b1.get());
 108         assertFalse(b2.get());
 109 
 110         assertEquals(opt.toString(), "OptionalInt[" + expected + "]");
 111     }
 112 
 113     @Test(groups = "unit")
 114     public void testEmpty() {
 115         checkEmpty(OptionalInt.empty());
 116     }
 117 
 118     @Test(groups = "unit")
 119     public void testPresent() {
 120         checkPresent(OptionalInt.of(INTVAL), INTVAL);
 121     }
 122 
 123     @Test(groups = "unit")
 124     public void testStreamEmpty() {
 125         assertEquals(OptionalInt.empty().stream().toArray(), new int[] { });
 126     }
 127 
 128     @Test(groups = "unit")
 129     public void testStreamPresent() {
 130         assertEquals(OptionalInt.of(INTVAL).stream().toArray(), new int[] { INTVAL });
 131     }
 132 }