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Testing Array Resource Decoding in Apktool

This test suite validates array decoding functionality in Apktool’s resource handling system. It focuses on verifying proper decoding of string arrays and general arrays from Android APK resources, ensuring correct type conversion and value preservation.

Test Coverage Overview

The test suite provides comprehensive coverage of array decoding operations in Apktool.

Key areas tested include:

String array resource decoding verification
General array resource type validation
Resource table handling and specification lookups
Proper resource value type checking

Implementation Analysis

The testing approach utilizes JUnit framework for systematic validation of array decoding functionality. It implements a class-level setup for resource table initialization and employs specific resource ID checks (0x7f020001 and 0x7f020000) to verify proper array value handling.

The implementation uses ResTable and ResArrayValue classes to manage resource data structures.

Technical Details

Testing tools and configuration:

JUnit test framework
ExtFile for APK file handling
ResourcesDecoder for resource extraction
Custom BaseTest extension for common functionality
TestUtils for resource directory management

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

Proper test setup and teardown using @BeforeClass and @AfterClass
Resource cleanup with proper file closing
Clear assertion messages for debugging
Isolated test cases for different array types
Effective use of inheritance for common test functionality

ibotpeaches/apktool

brut.apktool/apktool-lib/src/test/java/brut/androlib/decode/DecodeArrayTest.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.BaseTest;
import brut.androlib.TestUtils;
import brut.androlib.apk.ApkInfo;
import brut.androlib.res.ResourcesDecoder;
import brut.androlib.res.data.ResTable;
import brut.androlib.res.data.value.ResArrayValue;
import brut.androlib.res.data.value.ResValue;
import brut.common.BrutException;
import brut.directory.ExtFile;

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

public class DecodeArrayTest extends BaseTest {
    private static ResTable sResTable;

    @BeforeClass
    public static void beforeClass() throws Exception {
        TestUtils.copyResourceDir(MissingVersionManifestTest.class, "decode/issue1994", sTmpDir);

        LOGGER.info("Decoding issue1994.apk...");
        ExtFile testApk = new ExtFile(sTmpDir, "issue1994.apk");
        ApkInfo testInfo = new ApkInfo(testApk);
        ResourcesDecoder resDecoder = new ResourcesDecoder(testInfo, sConfig);
        resDecoder.loadMainPkg();
        sResTable = resDecoder.getResTable();
    }

    @AfterClass
    public static void afterClass() throws Exception {
        sResTable.getApkInfo().getApkFile().close();
    }

    @Test
    public void decodeStringArray() throws BrutException {
        ResValue value = sResTable.getResSpec(0x7f020001).getDefaultResource().getValue();
        assertTrue("Not a ResArrayValue. Found: " + value.getClass(), value instanceof ResArrayValue);
    }

    @Test
    public void decodeArray() throws BrutException {
        ResValue value = sResTable.getResSpec(0x7f020000).getDefaultResource().getValue();
        assertTrue("Not a ResArrayValue. Found: " + value.getClass(), value instanceof ResArrayValue);
    }
}