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Testing JAR File Build and Decode Operations in Apktool

This test suite validates the building and decoding functionality of JAR files within the Apktool library. It specifically tests the ability to pack and unpack JAR files while maintaining directory structure and file integrity, essential for Android application processing.

Test Coverage Overview

The test suite provides comprehensive coverage of JAR file handling operations in Apktool. It tests both the building of JAR files from a directory structure and subsequent decoding back to original files.

Tests JAR file creation from test resources
Validates directory structure preservation
Verifies successful file unpacking
Ensures AAPT1 compatibility

Implementation Analysis

The testing approach utilizes JUnit’s class-level setup with @BeforeClass for initialization and resource preparation. The implementation follows a sequential pattern of building and decoding operations, using Apktool’s core classes ApkBuilder and ApkDecoder.

Uses ExtFile for file system operations
Implements BaseTest extension for common functionality
Employs TestUtils for resource handling

Technical Details

JUnit 4 testing framework
Custom TestUtils for resource management
ExtFile extension for file operations
AAPT version 1 configuration
Temporary directory handling for test artifacts
Logging implementation for operation tracking

Best Practices Demonstrated

The test implementation showcases several testing best practices for Java-based build tools. It maintains clear separation of setup and test execution, proper resource cleanup, and explicit configuration management.

Proper test initialization and cleanup
Clear logging of test operations
Resource isolation using temporary directories
Structured test case organization

ibotpeaches/apktool

brut.apktool/apktool-lib/src/test/java/brut/androlib/aapt1/BuildAndDecodeJarTest.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 BuildAndDecodeJarTest extends BaseTest {

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

        LOGGER.info("Unpacking testjar...");
        TestUtils.copyResourceDir(BuildAndDecodeJarTest.class, "aapt1/testjar", sTestOrigDir);

        sConfig.setAaptVersion(1);

        LOGGER.info("Building testjar.jar...");
        ExtFile testJar = new ExtFile(sTmpDir, "testjar.jar");
        new ApkBuilder(sTestOrigDir, sConfig).build(testJar);

        LOGGER.info("Decoding testjar.jar...");
        new ApkDecoder(testJar, sConfig).decode(sTestNewDir);
    }

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