* @param description
     *            不正なindexであることの説明
     * @throws ClIndexOutOfBoundsException
     *             {@code expression}がfalseの場合。
     */
    public static void assertIndex(final boolean expression, final String description) {
        if (!expression) {
            throw new ClIndexOutOfBoundsException(description);
        }
    }

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.NoSuchElementException;

import org.codelibs.core.exception.ClIllegalStateException;
import org.codelibs.core.exception.ClIndexOutOfBoundsException;
import org.codelibs.core.io.SerializeUtil;
import org.junit.After;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;

/**