PacketTestUtils.java
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/*
* Copyright 2015 Open Networking Laboratory
*
* Licensed 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.onlab.packet;
import java.nio.ByteBuffer;
import static junit.framework.TestCase.fail;
import static org.junit.Assert.assertTrue;
/**
* Utilities for testing packet methods.
*/
public final class PacketTestUtils {
private PacketTestUtils() {
}
/**
* Tests that the Deserializer function is resilient to bad input parameters
* such as null input, negative offset and length, etc.
*
* @param deserializer deserializer function to test
*/
public static void testDeserializeBadInput(Deserializer deserializer) {
byte[] bytes = ByteBuffer.allocate(4).array();
try {
deserializer.deserialize(null, 0, 4);
fail("NullPointerException was not thrown");
} catch (NullPointerException e) {
assertTrue(true);
} catch (DeserializationException e) {
fail("NullPointerException was not thrown");
}
// input byte array length, offset and length don't make sense
expectDeserializationException(deserializer, bytes, -1, 0);
expectDeserializationException(deserializer, bytes, 0, -1);
expectDeserializationException(deserializer, bytes, 0, 5);
expectDeserializationException(deserializer, bytes, 2, 3);
expectDeserializationException(deserializer, bytes, 5, 0);
}
/**
* Tests that the Deserializer function is resilient to truncated input, or
* cases where the input byte array does not contain enough bytes to
* deserialize the packet.
*
* @param deserializer deserializer function to test
* @param header byte array of a full-size packet
*/
public static void testDeserializeTruncated(Deserializer deserializer,
byte[] header) {
byte[] truncated;
for (int i = 0; i < header.length; i++) {
truncated = new byte[i];
ByteBuffer.wrap(header).get(truncated);
expectDeserializationException(deserializer, truncated, 0, truncated.length);
}
}
/**
* Run the given deserializer function against the given inputs and verify
* that a DeserializationException is thrown. The the test will fail if a
* DeserializationException is not thrown by the deserializer function.
*
* @param deserializer deserializer function to test
* @param bytes input byte array
* @param offset input offset
* @param length input length
*/
public static void expectDeserializationException(Deserializer deserializer,
byte[] bytes, int offset, int length) {
try {
deserializer.deserialize(bytes, offset, length);
fail("DeserializationException was not thrown");
} catch (DeserializationException e) {
assertTrue(true);
}
}
}