DataInputDeserializerTest.java

/*
 * 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.flink.runtime.util;

import org.junit.Assert;
import org.junit.Test;

import java.io.IOException;

/**
 * Test suite for the {@link DataInputDeserializer} class.
 */
public class DataInputDeserializerTest {

	@Test
	public void testAvailable() throws Exception {
		byte[] bytes;
		DataInputDeserializer dis;

		bytes = new byte[] {};
		dis = new DataInputDeserializer(bytes, 0, bytes.length);
		Assert.assertEquals(bytes.length, dis.available());

		bytes = new byte[] {1, 2, 3};
		dis = new DataInputDeserializer(bytes, 0, bytes.length);
		Assert.assertEquals(bytes.length, dis.available());

		dis.readByte();
		Assert.assertEquals(2, dis.available());
		dis.readByte();
		Assert.assertEquals(1, dis.available());
		dis.readByte();
		Assert.assertEquals(0, dis.available());

		try {
			dis.readByte();
			Assert.fail("Did not throw expected IOException");
		} catch (IOException e) {
			// ignore
		}
		Assert.assertEquals(0, dis.available());
	}
}