test/jdk/java/util/Optional/BasicLong.java

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

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

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

public class BasicLong {
    static final long LONGVAL = 2_305_843_008_139_952_128L;
    static final long UNEXPECTED = 0xFEEDBEEFCAFEBABEL;

    /**
     * Checks a block of assertions over an empty OptionalLong.
     */
    void checkEmpty(OptionalLong empty) {
        assertTrue(empty.equals(OptionalLong.empty()));
        assertTrue(OptionalLong.empty().equals(empty));
        assertFalse(empty.equals(OptionalLong.of(UNEXPECTED)));
        assertFalse(OptionalLong.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.getAsLong());
        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(), "OptionalLong.empty");
    }

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

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

        assertEquals(opt.getAsLong(), 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(), "OptionalLong[" + expected + "]");
    }

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

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

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

    @Test(groups = "unit")
    public void testStreamPresent() {
        assertEquals(OptionalLong.of(LONGVAL).stream().toArray(), new long[] { LONGVAL });
    }
}