/*
* Copyright (C) 2011 The Guava Authors
*
* 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 com.google.common.hash;
import com.google.common.testing.NullPointerTester;
import junit.framework.TestCase;
import org.easymock.EasyMock;
import java.io.ByteArrayOutputStream;
/**
* Tests for {@link HashingOutputStream}.
*
* @author Nick Piepmeier
*/
public class HashingOutputStreamTest extends TestCase {
private Hasher hasher;
private HashFunction hashFunction;
private final ByteArrayOutputStream buffer = new ByteArrayOutputStream();
@Override protected void setUp() throws Exception {
super.setUp();
hasher = EasyMock.createMock(Hasher.class);
hashFunction = EasyMock.createMock(HashFunction.class);
EasyMock.expect(hashFunction.newHasher()).andReturn(hasher).once();
EasyMock.replay(hashFunction);
}
public void testWrite_putSingleByte() throws Exception {
int b = 'q';
EasyMock.expect(hasher.putByte((byte) b)).andReturn(hasher).once();
EasyMock.replay(hasher);
HashingOutputStream out = new HashingOutputStream(hashFunction, buffer);
out.write(b);
EasyMock.verify(hashFunction);
EasyMock.verify(hasher);
}
public void testWrite_putByteArray() throws Exception {
byte[] buf = new byte[] {'y', 'a', 'm', 's'};
EasyMock.expect(hasher.putBytes(buf, 0, buf.length)).andReturn(hasher).once();
EasyMock.replay(hasher);
HashingOutputStream out = new HashingOutputStream(hashFunction, buffer);
out.write(buf);
EasyMock.verify(hashFunction);
EasyMock.verify(hasher);
}
public void testWrite_putByteArrayAtPos() throws Exception {
byte[] buf = new byte[] {'y', 'a', 'm', 's'};
EasyMock.expect(hasher.putBytes(buf, 0, 3)).andReturn(hasher).once();
EasyMock.replay(hasher);
HashingOutputStream out = new HashingOutputStream(hashFunction, buffer);
out.write(buf, 0, 3);
EasyMock.verify(hashFunction);
EasyMock.verify(hasher);
}
public void testHash_hashesCorrectly() throws Exception {
byte[] buf = new byte[] {'y', 'a', 'm', 's'};
HashCode expectedHash = Hashing.md5().hashBytes(buf);
HashingOutputStream out = new HashingOutputStream(Hashing.md5(), buffer);
out.write(buf);
assertEquals(expectedHash, out.hash());
}
public void testChecksForNull() throws Exception {
NullPointerTester tester = new NullPointerTester();
tester.testAllPublicInstanceMethods(
new HashingOutputStream(Hashing.md5(), new ByteArrayOutputStream()));
tester.testAllPublicStaticMethods(HashingOutputStream.class);
tester.testAllPublicConstructors(HashingOutputStream.class);
}
}