jdk/test/java/util/Optional/BasicDouble.java

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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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/* @test
 * @summary Basic functional test of OptionalDouble
 * @author Mike Duigou
 * @run testng BasicDouble
 */

import java.util.NoSuchElementException;
import java.util.OptionalDouble;

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


public class BasicDouble {

    @Test(groups = "unit")
    public void testEmpty() {
        OptionalDouble empty = OptionalDouble.empty();
        OptionalDouble present = OptionalDouble.of(1.0);

        // empty
        assertTrue(empty.equals(empty));
        assertTrue(empty.equals(OptionalDouble.empty()));
        assertTrue(!empty.equals(present));
        assertTrue(0 == empty.hashCode());
        assertTrue(!empty.toString().isEmpty());
        assertTrue(!empty.isPresent());
        empty.ifPresent(v -> { fail(); });
        assertEquals(2.0, empty.orElse(2.0));
        assertEquals(2.0, empty.orElseGet(()-> 2.0));
    }

        @Test(expectedExceptions=NoSuchElementException.class)
        public void testEmptyGet() {
            OptionalDouble empty = OptionalDouble.empty();

            double got = empty.getAsDouble();
        }

        @Test(expectedExceptions=NullPointerException.class)
        public void testEmptyOrElseGetNull() {
            OptionalDouble empty = OptionalDouble.empty();

            double got = empty.orElseGet(null);
        }

        @Test(expectedExceptions=NullPointerException.class)
        public void testEmptyOrElseThrowNull() throws Throwable {
            OptionalDouble empty = OptionalDouble.empty();

            double got = empty.orElseThrow(null);
        }

        @Test(expectedExceptions=ObscureException.class)
        public void testEmptyOrElseThrow() throws Exception {
            OptionalDouble empty = OptionalDouble.empty();

            double got = empty.orElseThrow(ObscureException::new);
        }

        @Test(groups = "unit")
        public void testPresent() {
        OptionalDouble empty = OptionalDouble.empty();
        OptionalDouble present = OptionalDouble.of(1.0);

        // present
        assertTrue(present.equals(present));
        assertFalse(present.equals(OptionalDouble.of(0.0)));
        assertTrue(present.equals(OptionalDouble.of(1.0)));
        assertTrue(!present.equals(empty));
        assertTrue(Double.hashCode(1.0) == present.hashCode());
        assertFalse(present.toString().isEmpty());
        assertTrue(-1 != present.toString().indexOf(Double.toString(present.getAsDouble()).toString()));
        assertEquals(1.0, present.getAsDouble());
        try {
            present.ifPresent(v -> { throw new ObscureException(); });
            fail();
        } catch(ObscureException expected) {

        }
        assertEquals(1.0, present.orElse(2.0));
        assertEquals(1.0, present.orElseGet(null));
        assertEquals(1.0, present.orElseGet(()-> 2.0));
        assertEquals(1.0, present.orElseGet(()-> 3.0));
        assertEquals(1.0, present.<RuntimeException>orElseThrow(null));
        assertEquals(1.0, present.<RuntimeException>orElseThrow(ObscureException::new));
    }

    private static class ObscureException extends RuntimeException {

    }
}