// ASM: a very small and fast Java bytecode manipulation framework
// Copyright (c) 2000-2011 INRIA, France Telecom
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
// 3. Neither the name of the copyright holders nor the names of its
//    contributors may be used to endorse or promote products derived from
//    this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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package org.objectweb.asm.commons;

import static org.junit.jupiter.api.Assertions.assertArrayEquals;
import static org.junit.jupiter.api.Assertions.assertEquals;

import java.util.Arrays;
import org.junit.jupiter.api.Test;
import org.objectweb.asm.Attribute;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.Opcodes;

/**
 * Unit tests for {@link ModuleHashesAttribute}.
 *
 * @author Eric Bruneton
 */
class ModuleHashesAttributeTest {

  private static final byte[] HASH1 = {0x1, 0x2, 0x3};
  private static final byte[] HASH2 = {0x4, 0x5, 0x6};

  @Test
  void testWriteAndRead() {
    ClassWriter classWriter = new ClassWriter(0);
    classWriter.visitAttribute(
        new ModuleHashesAttribute(
            "algorithm",
            Arrays.asList(new String[] {"module1", "module2"}),
            Arrays.asList(new byte[][] {HASH1, HASH2})));

    ModuleHashesAttribute moduleHashesAttribute = new ModuleHashesAttribute();
    new ClassReader(classWriter.toByteArray())
        .accept(
            new ClassVisitor(/* latest */ Opcodes.ASM10_EXPERIMENTAL) {

              @Override
              public void visitAttribute(final Attribute attribute) {
                if (attribute instanceof ModuleHashesAttribute) {
                  moduleHashesAttribute.algorithm = ((ModuleHashesAttribute) attribute).algorithm;
                  moduleHashesAttribute.modules = ((ModuleHashesAttribute) attribute).modules;
                  moduleHashesAttribute.hashes = ((ModuleHashesAttribute) attribute).hashes;
                }
              }
            },
            new Attribute[] {new ModuleHashesAttribute()},
            0);

    assertEquals("algorithm", moduleHashesAttribute.algorithm);
    assertEquals(2, moduleHashesAttribute.modules.size());
    assertEquals("module1", moduleHashesAttribute.modules.get(0));
    assertEquals("module2", moduleHashesAttribute.modules.get(1));
    assertEquals(2, moduleHashesAttribute.hashes.size());
    assertArrayEquals(HASH1, moduleHashesAttribute.hashes.get(0));
    assertArrayEquals(HASH2, moduleHashesAttribute.hashes.get(1));
  }
}
