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Testing Empty Resources.arsc Processing in Apktool

This test suite validates the handling of empty resources.arsc files in Android APK processing using Apktool. It specifically tests the decoding and building functionality for APKs containing empty resource files, ensuring robust handling of edge cases in Android package manipulation.

Test Coverage Overview

The test suite focuses on verifying Apktool’s behavior when processing APKs with empty resources.arsc files.

Key areas covered include:

APK decoding with empty resource files
APK rebuilding after modification
Directory structure validation
AAPT1 compatibility checks

Implementation Analysis

The testing approach utilizes JUnit framework with a structured setup-execute-verify pattern. The implementation leverages BeforeClass annotation for test initialization and environment setup, ensuring consistent test conditions across multiple test runs.

Technical patterns include:

Resource directory copying
APK decoder configuration
Build process verification
Directory existence validation

Technical Details

Testing components and configuration:

JUnit 4 testing framework
ExtFile for file system operations
Custom TestUtils for resource handling
ApkDecoder and ApkBuilder utilities
AAPT version 1 configuration
Temporary directory management

Best Practices Demonstrated

The test implementation showcases several testing best practices:

Proper test setup isolation using @BeforeClass
Clear logging of test steps
Explicit configuration management
Resource cleanup handling
Modular test structure
Descriptive test method naming

ibotpeaches/apktool

brut.apktool/apktool-lib/src/test/java/brut/androlib/aapt1/EmptyResourcesArscTest.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.aapt1;

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

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

public class EmptyResourcesArscTest extends BaseTest {

    @BeforeClass
    public static void beforeClass() throws Exception {
        sTestOrigDir = new ExtFile(sTmpDir, "issue1730-orig");
        sTestNewDir = new ExtFile(sTmpDir, "issue1730-new");

        LOGGER.info("Unpacking issue1730.apk...");
        TestUtils.copyResourceDir(EmptyResourcesArscTest.class, "aapt1/issue1730", sTestOrigDir);

        sConfig.setAaptVersion(1);

        LOGGER.info("Decoding issue1730.apk...");
        ExtFile testApk = new ExtFile(sTestOrigDir, "issue1730.apk");
        new ApkDecoder(testApk, sConfig).decode(sTestNewDir);

        LOGGER.info("Building issue1730.apk...");
        new ApkBuilder(sTestNewDir, sConfig).build(testApk);
    }

    @Test
    public void buildAndDecodeTest() {
        assertTrue(sTestNewDir.isDirectory());
        assertTrue(sTestOrigDir.isDirectory());
    }
}