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Testing Protected APK Decoding Implementation in Apktool

This test suite validates the decoding functionality of Apktool when handling protected APK files. It specifically tests the ability to safely decode APKs with protected chunks while ensuring resource files are properly extracted.

Test Coverage Overview

The test coverage focuses on validating protected APK decoding functionality in Apktool.

Key areas covered include:

Protected APK file handling
Resource extraction verification
Crash prevention during decode operations
Validation of decoded file structure

Implementation Analysis

The testing approach utilizes JUnit framework with a focused single test case methodology. The implementation leverages the BaseTest class for common testing infrastructure and employs the ExtFile wrapper for file operations.

Testing patterns include:

Resource directory copying for test setup
Direct APK decoding verification
File existence validation

Technical Details

Testing components and configuration:

JUnit 4 testing framework
ApkDecoder utility class
TestUtils for resource management
ExtFile for enhanced file operations
Protected APK test fixture (protected-v1.apk)
Temporary directory management for test isolation

Best Practices Demonstrated

The test suite demonstrates several testing best practices for Android tooling verification.

Notable practices include:

Proper test setup using @BeforeClass annotation
Clean separation of test resources
Explicit test case naming
Resource cleanup management
Clear assertion conditions

ibotpeaches/apktool

brut.apktool/apktool-lib/src/test/java/brut/androlib/decode/ProtectedApkTest.java

            
/*
 *  Copyright (C) 2010 Ryszard Wiśniewski <[email protected]>
 *  Copyright (C) 2010 Connor Tumbleson <[email protected]>
 *
 *  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
 *
 *       https://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 brut.androlib.decode;

import brut.androlib.ApkDecoder;
import brut.androlib.BaseTest;
import brut.androlib.TestUtils;
import brut.directory.ExtFile;
import brut.common.BrutException;

import java.io.File;

import org.junit.*;
import static org.junit.Assert.*;

public class ProtectedApkTest extends BaseTest {
    private static final String TEST_APK = "protected-v1.apk";

    @BeforeClass
    public static void beforeClass() throws Exception {
        TestUtils.copyResourceDir(ProtectedApkTest.class, "decode/protected-chunks", sTmpDir);
    }

    @Test
    public void checkIfDecodeWorksWithoutCrash() throws BrutException {
        ExtFile testApk = new ExtFile(sTmpDir, TEST_APK);
        ExtFile testDir = new ExtFile(testApk + ".out");
        new ApkDecoder(testApk, sConfig).decode(testDir);

        assertTrue(new File(testDir, "res/values/strings.xml").isFile());
    }
}