测试在另一个类

Question

我目前正在努力解决我的任务问题。我必须为代理（MyCacheProxy）创建一个类，它将重定向请求图片。它在下面，似乎很好。

package ijp.proxy;

import ijp.Picture;
import ijp.service.Service;
import ijp.service.ServiceFromProperties;

public class MyCacheProxy {

private Service baseService = null;

public MyCacheProxy() 
{
    baseService = new ServiceFromProperties("MyCacheProxyTest.base_service");
}

public Picture getPicture(String subject, int index)
{
    Picture picture = baseService.getPicture(subject, index);

return picture;
}

}

然后为我们提供了测试该代理的类的代码模板。但是，模板会测试库中提供的单独代理。我想要做的是测试我上面创建的代理MyCacheProxy。我假设这可以通过导入我的MyCacheProxy类来完成，但它没有用。

我真的不确定如何进步，并希望得到任何帮助或提示。

package ijp.test;

import static org.junit.Assert.*;
import java.awt.image.BufferedImage;

import org.junit.Test;
import ijp.Picture;
import ijp.proxy.CacheProxy;
import ijp.service.Service;

/**
* A template for testing a cache proxy for the PictureViewer application.
* 
* @author YOUR NAME HERE
* @version YOUR VERSION HERE
*/
public class MyCacheProxyTest implements Service {

/**
 * Test that requests for the same subject and index return the same image.
 */
@Test
public void equalityTest() {

    Service proxy = new CacheProxy(this);
    Picture firstPicture = proxy.getPicture("equalityTest",2);
    Picture secondPicture = proxy.getPicture("equalityTest",2);
    assertTrue(
            "different picture returned for same subject (and index)",
            firstPicture.equals(secondPicture));
}

/**
 * Return a picture from the simulated service.
 * This service simply returns an empty picture every time that it called.
 * Note that a <em>different</em> object is returned each time, even if the
 * subject and index are the same.
 *
 * @param subject the requested subject
 * @param index the index of the picture within all pictures for the requested topic
 *
 * @return the picture
 */
@Override
public Picture getPicture(String subject, int index) {
    return new Picture((BufferedImage)null, subject ,serviceName(), index);
}

/**
 * Return a textual name to identify the simulated service.
 *
 * @return the name of the service ("cacheProxyTest")
 */
@Override
public String serviceName() {
    return "MyCacheProxyTest";
}
}