test/jdk/java/util/concurrent/CopyOnWriteArraySet/SerializationTest.java

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/*
 * @test
 * @bug 8365058
 * @summary Check basic correctness of de-serialization
 * @run junit SerializationTest
 */

import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.MethodSource;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.List;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.stream.Stream;

import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
import static org.junit.jupiter.api.Assertions.assertEquals;

public class SerializationTest {

    // Ensure basic serialization round trip correctness
    @ParameterizedTest
    @MethodSource
    void roundTripTest(CopyOnWriteArraySet<?> expected) {
        var bytes = ser(expected);
        var actual = deSer(bytes);
        assertEquals(CopyOnWriteArraySet.class, actual.getClass());
        assertEquals(expected, actual);
    }

    private static Stream<CopyOnWriteArraySet<?>> roundTripTest() {
        return Stream.of(
                new CopyOnWriteArraySet<>(),
                new CopyOnWriteArraySet<>(List.of(1, 2, 3)),
                new CopyOnWriteArraySet<>(Set.of("Foo", "Bar", "Baz"))
        );
    }

    private static byte[] ser(Object obj) {
        return assertDoesNotThrow(() -> {
            try (ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
                 ObjectOutputStream oos = new ObjectOutputStream(byteArrayOutputStream)) {
                oos.writeObject(obj);
                return byteArrayOutputStream.toByteArray();
            }
        }, "Unexpected error during serialization");
    }

    private static Object deSer(byte[] bytes) {
        return assertDoesNotThrow(() -> {
            try (ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(bytes);
                 ObjectInputStream ois = new ObjectInputStream(byteArrayInputStream)) {
                return ois.readObject();
            }
        }, "Unexpected error during de-serialization");
    }
}