// Copyright (c) 2007-Present Pivotal Software, Inc. All rights reserved.
//
// This software, the RabbitMQ Java client library, is triple-licensed under the
// Mozilla Public License 1.1 ("MPL"), the GNU General Public License version 2
// ("GPL") and the Apache License version 2 ("ASL"). For the MPL, please see
// LICENSE-MPL-RabbitMQ. For the GPL, please see LICENSE-GPL2. For the ASL,
// please see LICENSE-APACHE2.
//
// This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND,
// either express or implied. See the LICENSE file for specific language governing
// rights and limitations of this software.
//
// If you have any questions regarding licensing, please contact us at
// info@rabbitmq.com.
package com.rabbitmq.client.test;
import com.rabbitmq.client.impl.TruncatedInputStream;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import static org.junit.Assert.assertEquals;
/**
* Some basic (retroactive) tests for TruncatedInputStream.
*/
public class TruncatedInputStreamTest {
/** a sample truncated stream to run tests on */
private TruncatedInputStream _truncStream;
/** sample data to truncate */
private static final byte[] TEST_BYTES = new byte[] { 5, 4, 3, 2, 1 };
/** what length to truncate it to */
private static final int TRUNCATED_LENGTH = 3;
@Before public void setUp() throws Exception {
InputStream baseStream = new ByteArrayInputStream(TEST_BYTES);
_truncStream = new TruncatedInputStream(baseStream, TRUNCATED_LENGTH);
}
@After public void tearDown() throws Exception {
_truncStream = null;
}
/**
* Check the amount of data initially available is as it should be
* @throws IOException if there is an I/O problem
*/
@Test public void amountInitiallyAvailable() throws IOException {
assertEquals(TRUNCATED_LENGTH, _truncStream.available());
}
/**
* Check the data read from the truncated stream is as it should be
* @throws IOException if there is an I/O problem
*/
@Test public void readTruncatedBytes() throws IOException {
byte[] readBytes = new byte[TEST_BYTES.length];
int numRead = _truncStream.read(readBytes);
assertEquals(TRUNCATED_LENGTH, numRead);
for (int i = 0; i < TRUNCATED_LENGTH; i++) {
assertEquals(TEST_BYTES[i], readBytes[i]);
}
}
/**
* Check single-byte reads behave as they should
* @throws IOException
*
*/
@Test public void singleByteReads() throws IOException {
for (int i = 0; i < TRUNCATED_LENGTH; i++) {
assertEquals(TEST_BYTES[i], _truncStream.read());
}
assertEquals(-1, _truncStream.read());
}
private static final int TEST_OFFSET = 4;
private static final int TEST_LENGTH = 2;
/**
* Check reading a specified number of bytes at an offset gives the right result
*/
@Test public void offsetMultipleByteReads() throws IOException {
byte[] readBytes = new byte[TEST_OFFSET + TEST_LENGTH];
_truncStream.read(readBytes, TEST_OFFSET, TEST_LENGTH);
for (int i = 0; i < TEST_OFFSET; i++) { // check the array's initially blank...
assertEquals(0, readBytes[i]);
}
for (int i = 0; i < TEST_LENGTH; i++) { // ... and the rest of it a copy of the input
assertEquals(TEST_BYTES[i], readBytes[TEST_OFFSET + i]);
}
}
}