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Validating Generic Type Operations and Wildcards in JADX Decompiler

This test suite validates the functionality of ArgType class in the JADX decompiler, focusing on generic type handling and type variable operations. The tests ensure proper handling of Java generics, wildcards, and nested generic types.

Test Coverage Overview

The test suite provides comprehensive coverage of generic type operations in the ArgType class.

Key areas tested include:

Generic type equality comparisons
Type variable detection in wildcards
Nested generic type handling
Inner class generic type resolution

Integration points cover Java generics system and type parameter handling.

Implementation Analysis

The testing approach utilizes JUnit Jupiter for structured unit testing with a focus on type comparison and validation. The implementation leverages custom assertions through JadxAssertions for enhanced type checking.

Testing patterns include:

Direct equality comparison of generic types
Type variable presence verification
Complex nested generic type construction and validation

Technical Details

Testing tools and configuration:

JUnit Jupiter test framework
Custom JadxAssertions utility
ArgType utility methods for type construction
Specialized generic type builders and validators

Best Practices Demonstrated

The test suite demonstrates excellent testing practices through clear test case isolation and focused assertions. Each test method targets a specific aspect of generic type handling with explicit setup and verification steps.

Notable practices include:

Descriptive test method names
Isolated test scenarios
Comprehensive type checking
Clear test data setup

skylot/jadx

jadx-core/src/test/java/jadx/core/dex/instructions/args/ArgTypeTest.java

            
package jadx.core.dex.instructions.args;

import org.junit.jupiter.api.Test;

import static jadx.core.dex.instructions.args.ArgType.WildcardBound.SUPER;
import static jadx.core.dex.instructions.args.ArgType.generic;
import static jadx.core.dex.instructions.args.ArgType.genericType;
import static jadx.core.dex.instructions.args.ArgType.wildcard;
import static jadx.tests.api.utils.assertj.JadxAssertions.assertThat;

class ArgTypeTest {

	@Test
	public void testEqualsOfGenericTypes() {
		ArgType first = ArgType.generic("java.lang.List", ArgType.STRING);
		ArgType second = ArgType.generic("Ljava/lang/List;", ArgType.STRING);

		assertThat(first).isEqualTo(second);
	}

	@Test
	void testContainsGenericType() {
		ArgType wildcard = wildcard(genericType("T"), SUPER);
		assertThat(wildcard.containsTypeVariable()).isTrue();

		ArgType type = generic("java.lang.List", wildcard);
		assertThat(type.containsTypeVariable()).isTrue();
	}

	@Test
	void testInnerGeneric() {
		ArgType[] genericTypes = new ArgType[] { ArgType.genericType("K"), ArgType.genericType("V") };
		ArgType base = ArgType.generic("java.util.Map", genericTypes);

		ArgType genericInner = ArgType.outerGeneric(base, ArgType.generic("Entry", genericTypes));
		assertThat(genericInner.toString()).isEqualTo("java.util.Map<K, V>$Entry<K, V>");
		assertThat(genericInner.containsTypeVariable()).isTrue();

		ArgType genericInner2 = ArgType.outerGeneric(base, ArgType.object("Entry"));
		assertThat(genericInner2.toString()).isEqualTo("java.util.Map<K, V>$Entry");
		assertThat(genericInner2.containsTypeVariable()).isTrue();
	}
}