Mockito doReturn/when 执行真实方法（没有 CGILIB）

Question

我做了很多 Mockito 间谍，只是在一个新项目中模仿我自己的工作示例。但这失败得很惨

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.mockito.invocation.InvocationOnMock;
import org.mockito.stubbing.Answer;
import org.testng.annotations.BeforeMethod;
import org.testng.annotations.Test;

import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import static org.mockito.Mockito.*;

public class SpyTest {
    HttpClient httpClient;
    private HttpResponse httpResponse;
    private StatusLine responseStatus;
    private HttpEntity responseEntity;

    @BeforeMethod
    public void setupClient() throws Exception {
        List spy = spy(new ArrayList());
        doReturn(true).when(spy).addAll(any(Collection.class)); // this works!

        DefaultHttpClient directClient = new DefaultHttpClient();
        httpClient = spy(directClient);
        httpResponse = mock(HttpResponse.class);
        responseStatus = mock(StatusLine.class);
        responseEntity = mock(HttpEntity.class);
        doReturn(responseStatus).when(httpResponse).getStatusLine();
        doReturn(responseEntity).when(httpResponse).getEntity();
        doReturn(httpResponse).when(httpClient).execute(any(HttpPost.class)); // failing here
    }

    @Test
    public void itShouldSetupTheSpy() throws Exception {
        doReturn(200).when(responseStatus).getStatusCode();
        doReturn("OK").when(responseStatus).getReasonPhrase();
        doAnswer(new Answer() {
            @Override
            public Object answer(InvocationOnMock invocation) throws Throwable {
                OutputStream os = (OutputStream) invocation.getArguments()[0];
                os.write("{\"id\": 100}".getBytes());
                return null;
            }
        }).when(responseEntity).writeTo(any(OutputStream.class));
    }
}

但我有错误

java.lang.IllegalArgumentException：请求不能为空。 在 org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:801) 在 org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:784) 在 SpyTest.setupClient(SpyTest.java:37)

我相信我已经关注了the official advice！就像我的其他间谍一样。还有this answer！似乎不适用于我，因为从 maven 依赖树中可以看出我没有使用 CGLIB：

[信息] +- org.codehaus.jackson:jackson-mapper-asl:jar:1.9.3:compile [信息] | \- org.codehaus.jackson:jackson-core-asl:jar:1.9.3:compile [信息] +- org.testng:testng:jar:6.8:test [信息] | +- junit:junit:jar:4.10:test [信息] | | \- org.hamcrest:hamcrest-core:jar:1.1:test [信息] | +- org.beanshell:bsh:jar:2.0b4:test [信息] | +- com.beust:jcommander:jar:1.27:test [信息] | \- org.yaml:snakeyaml:jar:1.6:test [信息] +- org.mockito:mockito-all:jar:1.9.5:test [信息] +- com.newrelic:newrelic-api:jar:2.3.0:compile [信息] +- org.apache.httpcomponents:httpclient:jar:4.2.5:compile [信息] | +- org.apache.httpcomponents:httpcore:jar:4.2.4:compile [信息] | +- commons-logging:commons-logging:jar:1.1.1:compile [信息] | \- commons-codec:commons-codec:jar:1.6:compile [信息] \- org.apache.commons:commons-lang3:jar:3.1:compile

看起来 HttpClient 及其子类有问题。

Answer 1

execute 是 final method，而 Mockito 无法模拟最终方法（如 the section on spying 和 the FAQ 中所述）。

为什么？因为在正常情况下您无法覆盖 final 方法，Java 采用捷径并将调用（对 final 方法）直接编译到实现，而不是在 Java's equivalent of a virtual method table 中查找它们。这意味着 Mockito 永远不会参与最终方法调用，因此无法拦截行为甚至接收存根/验证调用。

您可以切换到模拟并改用a raw HttpClient 吗？您可以模拟接口的任何方法，而不必担心可见性或最终方法问题。