jdk-24/jdk/test/java/util/Iterator/PrimitiveIteratorDefaults.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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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import org.testng.annotations.Test;

import java.util.PrimitiveIterator;
import java.util.function.Consumer;
import java.util.function.DoubleConsumer;
import java.util.function.IntConsumer;
import java.util.function.LongConsumer;

import static org.testng.Assert.assertNotNull;
import static org.testng.Assert.assertTrue;

/**
 * @test
 * @run testng PrimitiveIteratorDefaults
 * @summary test default methods on PrimitiveIterator
 */
@Test
public class PrimitiveIteratorDefaults {

    public void testIntForEachRemainingWithNull() {
        PrimitiveIterator.OfInt i = new PrimitiveIterator.OfInt() {
            @Override
            public int nextInt() {
                return 0;
            }

            @Override
            public boolean hasNext() {
                return false;
            }
        };

        executeAndCatch(() -> i.forEachRemaining((IntConsumer) null));
        executeAndCatch(() -> i.forEachRemaining((Consumer<Integer>) null));
    }

    public void testLongForEachRemainingWithNull() {
        PrimitiveIterator.OfLong i = new PrimitiveIterator.OfLong() {
            @Override
            public long nextLong() {
                return 0;
            }

            @Override
            public boolean hasNext() {
                return false;
            }
        };

        executeAndCatch(() -> i.forEachRemaining((LongConsumer) null));
        executeAndCatch(() -> i.forEachRemaining((Consumer<Long>) null));
    }

    public void testDoubleForEachRemainingWithNull() {
        PrimitiveIterator.OfDouble i = new PrimitiveIterator.OfDouble() {
            @Override
            public double nextDouble() {
                return 0;
            }

            @Override
            public boolean hasNext() {
                return false;
            }
        };

        executeAndCatch(() -> i.forEachRemaining((DoubleConsumer) null));
        executeAndCatch(() -> i.forEachRemaining((Consumer<Double>) null));
    }

    private void executeAndCatch(Runnable r) {
        executeAndCatch(NullPointerException.class, r);
    }

    private void executeAndCatch(Class<? extends Exception> expected, Runnable r) {
        Exception caught = null;
        try {
            r.run();
        }
        catch (Exception e) {
            caught = e;
        }

        assertNotNull(caught,
                      String.format("No Exception was thrown, expected an Exception of %s to be thrown",
                                    expected.getName()));
        assertTrue(expected.isInstance(caught),
                   String.format("Exception thrown %s not an instance of %s",
                                 caught.getClass().getName(), expected.getName()));
    }

}