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Testing JDK Dynamic Proxy Implementation in JCSprout

This test suite validates JDK dynamic proxy implementation in the JCSprout project, focusing on proxy creation and execution verification. The tests demonstrate proper usage of Java’s built-in proxy mechanisms for runtime interface implementation.

Test Coverage Overview

The test suite covers core JDK proxy functionality with specific focus on dynamic proxy instantiation and method invocation.

Validates proxy creation using Proxy.newProxyInstance()
Tests custom invocation handler implementation
Verifies proper interface implementation
Includes proxy class generation testing capabilities

Implementation Analysis

The testing approach utilizes JUnit 4 framework for unit testing JDK proxy implementations. The tests employ a custom invocation handler (CustomizeHandle) and verify proxy behavior through interface-based testing patterns.

Key implementation patterns include:

Dynamic proxy creation with class loader injection
Interface-based proxy verification
Proxy class generation and file output capabilities

Technical Details

Testing infrastructure includes:

JUnit 4 testing framework
Java Reflection API
java.lang.reflect.Proxy for dynamic proxy creation
Custom implementation of InvocationHandler
ProxyGenerator for proxy class generation (commented code)

Best Practices Demonstrated

The test suite exemplifies several testing best practices for proxy-based implementations.

Clean separation of proxy creation and execution verification
Proper exception handling in proxy class generation
Clear test method naming conventions
Focused test methods with single responsibility

crossoverjie/jcsprout

src/test/java/com/crossoverjie/proxy/JDKProxyTest.java

            
package com.crossoverjie.proxy;

import com.crossoverjie.proxy.jdk.CustomizeHandle;
import com.crossoverjie.proxy.jdk.ISubject;
import com.crossoverjie.proxy.jdk.impl.ISubjectImpl;
import org.junit.Test;

import java.lang.reflect.Proxy;

/**
 * Function: JDK 代理单测
 *
 * @author crossoverJie
 *         Date: 23/12/2017 22:40
 * @since JDK 1.8
 */
public class JDKProxyTest {

    @Test
    public void test(){
        CustomizeHandle handle = new CustomizeHandle(ISubjectImpl.class) ;
        ISubject subject = (ISubject) Proxy.newProxyInstance(JDKProxyTest.class.getClassLoader(), new Class[]{ISubject.class}, handle);
        subject.execute() ;
    }

    @Test
    public void clazzTest(){
//        byte[] proxyClassFile = ProxyGenerator.generateProxyClass(
//                "$Proxy1", new Class[]{ISubject.class}, 1);
//        try {
//            FileOutputStream out = new FileOutputStream("/Users/chenjie/Documents/$Proxy1.class") ;
//            out.write(proxyClassFile);
//            out.close();
//        } catch (FileNotFoundException e) {
//            e.printStackTrace();
//        } catch (IOException e) {
//            e.printStackTrace();
//        }
    }
}