test/jdk/java/util/Optional/BasicInt.java

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/* @test
 * @bug 8195649
 * @summary Basic functional test of OptionalInt
 * @author Mike Duigou
 * @build ObscureException
 * @run testng BasicInt
 */

import java.util.NoSuchElementException;
import java.util.OptionalInt;
import java.util.concurrent.atomic.AtomicBoolean;

import static org.testng.Assert.*;
import org.testng.annotations.Test;

public class BasicInt {

    static final int INTVAL = 33_550_336;
    static final int UNEXPECTED = 0xCAFEBABE;

    /**
     * Checks a block of assertions over an empty OptionalInt.
     */
    void checkEmpty(OptionalInt empty) {
        assertTrue(empty.equals(OptionalInt.empty()));
        assertTrue(OptionalInt.empty().equals(empty));
        assertFalse(empty.equals(OptionalInt.of(UNEXPECTED)));
        assertFalse(OptionalInt.of(UNEXPECTED).equals(empty));
        assertFalse(empty.equals("unexpected"));

        assertFalse(empty.isPresent());
        assertTrue(empty.isEmpty());
        assertEquals(empty.hashCode(), 0);
        assertEquals(empty.orElse(UNEXPECTED), UNEXPECTED);
        assertEquals(empty.orElseGet(() -> UNEXPECTED), UNEXPECTED);

        assertThrows(NoSuchElementException.class, () -> empty.getAsInt());
        assertThrows(NoSuchElementException.class, () -> empty.orElseThrow());
        assertThrows(ObscureException.class,       () -> empty.orElseThrow(ObscureException::new));

        var b = new AtomicBoolean();
        empty.ifPresent(s -> b.set(true));
        assertFalse(b.get());

        var b1 = new AtomicBoolean(false);
        var b2 = new AtomicBoolean(false);
        empty.ifPresentOrElse(s -> b1.set(true), () -> b2.set(true));
        assertFalse(b1.get());
        assertTrue(b2.get());

        assertEquals(empty.toString(), "OptionalInt.empty");
    }

    /**
     * Checks a block of assertions over an OptionalInt that is expected to
     * have a particular value present.
     */
    void checkPresent(OptionalInt opt, int expected) {
        assertFalse(opt.equals(OptionalInt.empty()));
        assertFalse(OptionalInt.empty().equals(opt));
        assertTrue(opt.equals(OptionalInt.of(expected)));
        assertTrue(OptionalInt.of(expected).equals(opt));
        assertFalse(opt.equals(OptionalInt.of(UNEXPECTED)));
        assertFalse(OptionalInt.of(UNEXPECTED).equals(opt));
        assertFalse(opt.equals("unexpected"));

        assertTrue(opt.isPresent());
        assertFalse(opt.isEmpty());
        assertEquals(opt.hashCode(), Integer.hashCode(expected));
        assertEquals(opt.orElse(UNEXPECTED), expected);
        assertEquals(opt.orElseGet(() -> UNEXPECTED), expected);

        assertEquals(opt.getAsInt(), expected);
        assertEquals(opt.orElseThrow(), expected);
        assertEquals(opt.orElseThrow(ObscureException::new), expected);

        var b = new AtomicBoolean(false);
        opt.ifPresent(s -> b.set(true));
        assertTrue(b.get());

        var b1 = new AtomicBoolean(false);
        var b2 = new AtomicBoolean(false);
        opt.ifPresentOrElse(s -> b1.set(true), () -> b2.set(true));
        assertTrue(b1.get());
        assertFalse(b2.get());

        assertEquals(opt.toString(), "OptionalInt[" + expected + "]");
    }

    @Test(groups = "unit")
    public void testEmpty() {
        checkEmpty(OptionalInt.empty());
    }

    @Test(groups = "unit")
    public void testPresent() {
        checkPresent(OptionalInt.of(INTVAL), INTVAL);
    }

    @Test(groups = "unit")
    public void testStreamEmpty() {
        assertEquals(OptionalInt.empty().stream().toArray(), new int[] { });
    }

    @Test(groups = "unit")
    public void testStreamPresent() {
        assertEquals(OptionalInt.of(INTVAL).stream().toArray(), new int[] { INTVAL });
    }
}