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Testing Positional Enumeration Pattern Handling in Apktool

This test suite validates the positional enumeration functionality in the Apktool library’s XML encoding system. It focuses on verifying the correct handling of string format arguments and their conversion to positional format specifiers.

Test Coverage Overview

The test suite provides comprehensive coverage of string format argument handling across various scenarios. Key functionality includes:

Single argument validation
Multiple argument handling (2-4 arguments)
Mixed positional and non-positional format specifiers
Edge cases with existing positional arguments

Implementation Analysis

The testing approach uses JUnit to systematically verify the ResXmlEncoders.enumerateNonPositionalSubstitutionsIfRequired method. Each test case follows a clear pattern of input-output validation using assertEquals assertions, with increasing complexity in argument patterns.

The implementation leverages inheritance from BaseTest for common testing infrastructure.

Technical Details

Testing tools and configuration:

JUnit 4 testing framework
Custom BaseTest class extension
ResXmlEncoders utility class integration
String format pattern validation

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

Atomic test methods with single responsibility
Clear naming conventions for test methods
Systematic progression from simple to complex cases
Consistent assertion patterns
Proper test isolation and setup

ibotpeaches/apktool

brut.apktool/apktool-lib/src/test/java/brut/androlib/encoders/PositionalEnumerationTest.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.encoders;

import brut.androlib.BaseTest;
import brut.androlib.res.xml.ResXmlEncoders;

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

public class PositionalEnumerationTest extends BaseTest {

    @Test
    public void noArgumentsTest() {
        assertEquals("test", enumerateArguments("test"));
    }

    @Test
    public void twoArgumentsTest() {
        assertEquals("%1$s, %2$s, and 1 other.", enumerateArguments("%s, %s, and 1 other."));
    }

    @Test
    public void twoPositionalArgumentsTest() {
        assertEquals("%1$s, %2$s and 1 other", enumerateArguments("%1$s, %2$s and 1 other"));
    }

    @Test
    public void threeArgumentsTest() {
        assertEquals("%1$s, %2$s, and %3$d other.", enumerateArguments("%s, %s, and %d other."));
    }

    @Test
    public void threePositionalArgumentsTest() {
        assertEquals(" %1$s, %2$s and %3$d other", enumerateArguments(" %1$s, %2$s and %3$d other"));
    }

    @Test
    public void fourArgumentsTest() {
        assertEquals("%1$s, %2$s, and %3$d other and %4$d.", enumerateArguments("%s, %s, and %d other and %d."));
    }

    @Test
    public void fourPositionalArgumentsTest() {
        assertEquals(" %1$s, %2$s and %3$d other and %4$d.", enumerateArguments(" %1$s, %2$s and %3$d other and %4$d."));
    }

    private String enumerateArguments(String value) {
        return ResXmlEncoders.enumerateNonPositionalSubstitutionsIfRequired(value);
    }
}