Add simple tests for DictionaryUtil. (#3301)

/*

 * Licensed to the Apache Software Foundation (ASF) under one or more

 * contributor license agreements.  See the NOTICE file distributed with

 * this work for additional information regarding copyright ownership.

 * The ASF licenses this file to You under the Apache License, Version 2.0

 * (the "License"); you may not use this file except in compliance with

 * the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 *

 */

package org.apache.skywalking.apm.agent.core.dictionary;

import org.junit.Assert;

import org.junit.Test;

/**

 * @author Alan Lau

 */

public class DictionaryUtilTests {

    @Test

    public void testNullValue() {

        Assert.assertEquals(0, DictionaryUtil.nullValue());

    }

    @Test

    public void testIsNull() {

        Assert.assertEquals(false, DictionaryUtil.isNull(1));

        Assert.assertEquals(true, DictionaryUtil.isNull(0));

    }

}