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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 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 Optional

 * @author Mike Duigou

 * @run testng Basic

 */

import java.util.NoSuchElementException;

import java.util.Optional;

import static org.testng.Assert.*;

import org.testng.annotations.Test;

public class Basic {

    @Test(groups = "unit")

    public void testEmpty() {

        Optional<Boolean> empty = Optional.empty();

        Optional<String> presentEmptyString = Optional.of("");

        Optional<Boolean> present = Optional.of(Boolean.TRUE);

        // empty

        assertTrue(empty.equals(empty));

        assertTrue(empty.equals(Optional.empty()));

        assertTrue(!empty.equals(present));

        assertTrue(0 == empty.hashCode());

        assertTrue(!empty.toString().isEmpty());

        assertTrue(!empty.toString().equals(presentEmptyString.toString()));

        assertTrue(!empty.isPresent());

        empty.ifPresent(v -> { fail(); });

        assertSame(null, empty.orElse(null));

        RuntimeException orElse = new RuntimeException() { };

        assertSame(Boolean.FALSE, empty.orElse(Boolean.FALSE));

        assertSame(null, empty.orElseGet(()-> null));

        assertSame(Boolean.FALSE, empty.orElseGet(()-> Boolean.FALSE));

    }

        @Test(expectedExceptions=NoSuchElementException.class)

        public void testEmptyGet() {

            Optional<Boolean> empty = Optional.empty();

            Boolean got = empty.get();

        }

        @Test(expectedExceptions=NullPointerException.class)

        public void testEmptyOrElseGetNull() {

            Optional<Boolean> empty = Optional.empty();

            Boolean got = empty.orElseGet(null);

        }

        @Test(expectedExceptions=NullPointerException.class)

        public void testEmptyOrElseThrowNull() throws Throwable {

            Optional<Boolean> empty = Optional.empty();

            Boolean got = empty.orElseThrow(null);

        }

        @Test(expectedExceptions=ObscureException.class)

        public void testEmptyOrElseThrow() throws Exception {

            Optional<Boolean> empty = Optional.empty();

            Boolean got = empty.orElseThrow(ObscureException::new);

        }

        @Test(groups = "unit")

        public void testPresent() {

        Optional<Boolean> empty = Optional.empty();

        Optional<String> presentEmptyString = Optional.of("");

        Optional<Boolean> present = Optional.of(Boolean.TRUE);

        // present

        assertTrue(present.equals(present));

        assertTrue(present.equals(Optional.of(Boolean.TRUE)));

        assertTrue(!present.equals(empty));

        assertTrue(Boolean.TRUE.hashCode() == present.hashCode());

        assertTrue(!present.toString().isEmpty());

        assertTrue(!present.toString().equals(presentEmptyString.toString()));

        assertTrue(-1 != present.toString().indexOf(Boolean.TRUE.toString()));

        assertSame(Boolean.TRUE, present.get());

        try {

            present.ifPresent(v -> { throw new ObscureException(); });

            fail();

        } catch(ObscureException expected) {

        }

        assertSame(Boolean.TRUE, present.orElse(null));

        assertSame(Boolean.TRUE, present.orElse(Boolean.FALSE));

        assertSame(Boolean.TRUE, present.orElseGet(null));

        assertSame(Boolean.TRUE, present.orElseGet(()-> null));

        assertSame(Boolean.TRUE, present.orElseGet(()-> Boolean.FALSE));

        assertSame(Boolean.TRUE, present.<RuntimeException>orElseThrow( null));

        assertSame(Boolean.TRUE, present.<RuntimeException>orElseThrow(ObscureException::new));

    }

    private static class ObscureException extends RuntimeException {

    }

}