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/*
* Copyright (C) 2013 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 static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.verifyNoMoreInteractions;
import static org.mockito.Mockito.when;
import com.google.common.testing.NullPointerTester;
import java.io.ByteArrayInputStream;
import java.util.Arrays;
import junit.framework.TestCase;
/**
* Tests for {@link HashingInputStream}.
*
* @author Qian Huang
*/
public class HashingInputStreamTest extends TestCase {
private Hasher hasher;
private HashFunction hashFunction;
private static final byte[] testBytes = new byte[] {'y', 'a', 'm', 's'};
private ByteArrayInputStream buffer;
@SuppressWarnings("DoNotMock")
@Override
protected void setUp() throws Exception {
super.setUp();
hasher = mock(Hasher.class);
hashFunction = mock(HashFunction.class);
buffer = new ByteArrayInputStream(testBytes);
when(hashFunction.newHasher()).thenReturn(hasher);
}
public void testRead_putSingleByte() throws Exception {
HashingInputStream in = new HashingInputStream(hashFunction, buffer);
int b = in.read();
assertEquals('y', b);
verify(hasher).putByte((byte) 'y');
verify(hashFunction).newHasher();
verifyNoMoreInteractions(hashFunction, hasher);
}
public void testRead_putByteArray() throws Exception {
HashingInputStream in = new HashingInputStream(hashFunction, buffer);
byte[] buf = new byte[4];
int numOfByteRead = in.read(buf, 0, buf.length);
assertEquals(4, numOfByteRead);
for (int i = 0; i < testBytes.length; i++) {
assertEquals(testBytes[i], buf[i]);
}
verify(hasher).putBytes(testBytes, 0, testBytes.length);
verify(hashFunction).newHasher();
verifyNoMoreInteractions(hashFunction, hasher);
}
public void testRead_putByteArrayAtPos() throws Exception {
HashingInputStream in = new HashingInputStream(hashFunction, buffer);
byte[] buf = new byte[3];
int numOfByteRead = in.read(buf, 0, 3);
assertEquals(3, numOfByteRead);
for (int i = 0; i < numOfByteRead; i++) {
assertEquals(testBytes[i], buf[i]);
}
verify(hasher).putBytes(Arrays.copyOf(testBytes, 3), 0, 3);
verify(hashFunction).newHasher();
verifyNoMoreInteractions(hashFunction, hasher);
}
public void testRead_putByteArrayOutOfBound() throws Exception {
byte[] buf = new byte[100];
byte[] expectedBytes = buf.clone();
System.arraycopy(testBytes, 0, expectedBytes, 0, testBytes.length);
HashingInputStream in = new HashingInputStream(hashFunction, buffer);
int numOfByteRead = in.read(buf, 0, 100);
assertEquals(4, numOfByteRead);
for (int i = 0; i < numOfByteRead; i++) {
assertEquals(testBytes[i], buf[i]);
}
verify(hasher).putBytes(expectedBytes, 0, 4);
verify(hashFunction).newHasher();
verifyNoMoreInteractions(hashFunction, hasher);
}
public void testHash_hashesCorrectly() throws Exception {
HashCode expectedHash = Hashing.md5().hashBytes(testBytes);
HashingInputStream in = new HashingInputStream(Hashing.md5(), buffer);
byte[] buf = new byte[4];
int numOfByteRead = in.read(buf, 0, buf.length);
assertEquals(4, numOfByteRead);
assertEquals(expectedHash, in.hash());
}
public void testHash_hashesCorrectlyReadOutOfBound() throws Exception {
HashCode expectedHash = Hashing.md5().hashBytes(testBytes);
HashingInputStream in = new HashingInputStream(Hashing.md5(), buffer);
byte[] buf = new byte[100];
int numOfByteRead = in.read(buf, 0, buf.length);
assertEquals(-1, in.read()); // additional read
assertEquals(4, numOfByteRead);
assertEquals(expectedHash, in.hash());
}
public void testHash_hashesCorrectlyForSkipping() throws Exception {
HashCode expectedHash = Hashing.md5().hashBytes(new byte[] {'m', 's'});
HashingInputStream in = new HashingInputStream(Hashing.md5(), buffer);
long numOfByteSkipped = in.skip(2);
assertEquals(2, numOfByteSkipped);
byte[] buf = new byte[4];
int numOfByteRead = in.read(buf, 0, buf.length);
assertEquals(2, numOfByteRead);
assertEquals(expectedHash, in.hash());
}
public void testChecksForNull() throws Exception {
NullPointerTester tester = new NullPointerTester();
tester.testAllPublicInstanceMethods(new HashingInputStream(Hashing.md5(), buffer));
tester.testAllPublicStaticMethods(HashingInputStream.class);
tester.testAllPublicConstructors(HashingInputStream.class);
}
}
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