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/*
* SonarQube
* Copyright (C) 2009-2021 SonarSource SA
* mailto:info AT sonarsource DOT com
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package org.sonar.duplications.block;
import java.util.List;
import org.junit.Test;
import org.sonar.duplications.statement.Statement;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertThat;
public class BlockChunkerTest extends BlockChunkerTestCase {
@Override
protected BlockChunker createChunkerWithBlockSize(int blockSize) {
return new BlockChunker(blockSize);
}
/**
* Rolling hash must produce exactly the same values as without rolling behavior.
* Moreover those values must always be the same (without dependency on JDK).
*/
@Test
public void shouldCalculateHashes() {
List<Statement> statements = createStatementsFromStrings("aaaaaa", "bbbbbb", "cccccc", "dddddd", "eeeeee");
BlockChunker blockChunker = createChunkerWithBlockSize(3);
List<Block> blocks = blockChunker.chunk("resource", statements);
assertThat(blocks.get(0).getBlockHash(), equalTo(hash("aaaaaa", "bbbbbb", "cccccc")));
assertThat(blocks.get(1).getBlockHash(), equalTo(hash("bbbbbb", "cccccc", "dddddd")));
assertThat(blocks.get(2).getBlockHash(), equalTo(hash("cccccc", "dddddd", "eeeeee")));
assertThat(blocks.get(0).getBlockHash().toString(), is("fffffeb6ae1af4c0"));
assertThat(blocks.get(1).getBlockHash().toString(), is("fffffebd8512d120"));
assertThat(blocks.get(2).getBlockHash().toString(), is("fffffec45c0aad80"));
}
private ByteArray hash(String... statements) {
long hash = 0;
for (String statement : statements) {
hash = hash * 31 + statement.hashCode();
}
return new ByteArray(hash);
}
}
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