org.jacoco.core.internal.data.CRC64Test.java Source code

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Here is the source code for org.jacoco.core.internal.data.CRC64Test.java

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/*******************************************************************************
 * Copyright (c) 2009, 2019 Mountainminds GmbH & Co. KG and Contributors
 * This program and the accompanying materials are made available under
 * the terms of the Eclipse Public License 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *    Marc R. Hoffmann - initial API and implementation
 *
 *******************************************************************************/
package org.jacoco.core.internal.data;

import static org.junit.Assert.assertEquals;

import java.io.UnsupportedEncodingException;

import org.jacoco.core.data.ExecutionDataWriter;
import org.junit.Test;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.Opcodes;

/**
 * Unit tests for {@link CRC64}.
 */
public class CRC64Test {

    @Test
    public void except_java_9_checksums_should_be_different_for_different_bytecode_versions() {
        assertEquals(0x589E9080A572741EL, CRC64.classId(createClass(Opcodes.V10)));

        // should remove workaround for Java 9
        // during change of exec file version
        assertEquals(0x1007, ExecutionDataWriter.FORMAT_VERSION);

        assertEquals(0xB5284860A572741CL, CRC64.classId(createClass(Opcodes.V9)));

        assertEquals(0xB5284860A572741CL, CRC64.classId(createClass(Opcodes.V1_8)));

        assertEquals(0x45284D30A572741AL, CRC64.classId(createClass(Opcodes.V1_7)));
    }

    private static byte[] createClass(final int version) {
        final ClassWriter cw = new ClassWriter(0);
        cw.visit(version, 0, "Foo", null, "java/lang/Object", null);
        cw.visitEnd();
        cw.toByteArray();
        return cw.toByteArray();
    }

    @Test
    public void test0() {
        final long sum = CRC64.classId(new byte[0]);
        assertEquals(0L, sum);
    }

    /**
     * Example taken from http://swissknife.sourceforge.net/docs/CRC64.html
     *
     * @throws UnsupportedEncodingException
     */
    @Test
    public void test1() throws UnsupportedEncodingException {
        final long sum = CRC64.classId("IHATEMATH".getBytes("ASCII"));
        assertEquals(0xE3DCADD69B01ADD1L, sum);
    }

    /**
     * Example generated with http://fsumfe.sourceforge.net/
     *
     * @throws UnsupportedEncodingException
     */
    @Test
    public void test2() {
        final long sum = CRC64.classId(new byte[] { (byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff,
                (byte) 0xff, (byte) 0xff, (byte) 0xff });
        assertEquals(0x5300000000000000L, sum);
    }

    /**
     * Example generated with http://fsumfe.sourceforge.net/
     *
     * @throws UnsupportedEncodingException
     */
    @Test
    public void test3() throws UnsupportedEncodingException {
        final long sum = CRC64.classId("JACOCO_JACOCO_JACOCO_JACOCO".getBytes("ASCII"));
        assertEquals(0xD8016B38AAD48308L, sum);
    }

}