Trux

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;
 
public class Assert {
    /**
     * Assert that an object is serializable by dumping it and then reading it
     * back and finally by checking the original object and the dumped and read
     * object are equals.
     *
     * <p>Obviously, the method <code>equals()</code> has to be implemented
     * correctly for this method can work.
     * @param objOriginal the instance which will be checked against serialization;
     * must implement <code>equals()</code> or it won't work
     */
    public static void assertSerializable(Object objOriginal) {
        try {
            final ByteArrayOutputStream stream = new ByteArrayOutputStream();
            final ObjectOutputStream out = new ObjectOutputStream(stream);
            out.writeObject(objOriginal);
            out.close();
 
            final ObjectInputStream in = new ObjectInputStream(new ByteArrayInputStream(stream.toByteArray()));
            final Object objSerialized = in.readObject();
            assertEquals(objOriginal, objSerialized);
        } catch (IOException e) {
            fail("unable to serialize or deserialize object " + objOriginal + ": " + e.getMessage());
        } catch (ClassNotFoundException e) {
            // unlikely to happen...
            fail(e.getMessage());
        }
    }
}
</p>