WireMock-实现Http Server Mock用于单元测试

作者：聂勇 欢迎转载，请保留作者信息并说明文章来源！

• 预备
• 业务示例代码
• 单元测试代码
• 参考资料

前一篇文章”使用jetty实现Http Server Mock作单元测试”讲了用Jetty实现Http Server Mock来模拟依赖的外部HTTP服务系统，但如果需要更多的功能，如：区分GET和POST；匹配请求的URL；匹配Http Header；匹配请求内容等等。 实际研发的过程中这些功能都有可能会用到，如果还是用Jetty来实现，需要自己不停地动手去添砖加瓦，虽然有成就感，但在快速迭代的节奏下不一定有足够的时间去做这些。 这时我们需要一个现成的类库来满足我们这些需求，WireMock和MockServer都可以做到，这里只讲WireMock。

预备

• JUnit 4.11
• wiremock 1.46

业务示例代码

源码下载

package cn.aofeng.demo.jetty;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import org.apache.commons.io.IOUtils;

/**
 * 抓取页面内容。
 * 
 * @author <a href="mailto:aofengblog@163.com">聂勇</a>
 */
public class HttpGet {

    public String getSomeThing(String urlStr) throws IOException {
        URL url = new URL(urlStr);
        HttpURLConnection urlConn = (HttpURLConnection) url.openConnection();
        urlConn.setConnectTimeout(3000);
        urlConn.setRequestMethod("GET");
        urlConn.connect();

        InputStream ins = null;
        try {
            if (200 == urlConn.getResponseCode()) {
                ins = urlConn.getInputStream();
                ByteArrayOutputStream outs = new ByteArrayOutputStream(1024);
                IOUtils.copy(ins, outs);
                return outs.toString("UTF-8");
            }
        } catch (IOException e) {
            throw e;
        } finally {
            IOUtils.closeQuietly(ins);
        }

        return null;
    }

}

单元测试代码

源码下载

package cn.aofeng.demo.wiremock;

import static org.junit.Assert.*;

import org.junit.After;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;

import static com.github.tomakehurst.wiremock.client.WireMock.*;
import com.github.tomakehurst.wiremock.junit.WireMockRule;

import cn.aofeng.demo.jetty.HttpGet;

/**
 * {@link HttpGet}的单元测试用例。
 * 
 * @author <a href="mailto:aofengblog@163.com">聂勇</a>
 */
public class HttpGetTest {

    private HttpGet _httpGet = new HttpGet();

    @Rule
    public WireMockRule _wireMockRule = new WireMockRule(9191);

    @Before
    public void setUp() throws Exception {
    }

    @After
    public void tearDown() throws Exception {
    }

    /**
     * 用例：响应状态码为200且有响应内容。
     */
    @Test
    public void testGetSomeThing4Success() throws Exception {
        // 设置Mock
        String response = "Hello, The World!";
        stubFor(get(urlEqualTo("/hello"))
                .willReturn(aResponse()
                        .withStatus(200)
                        .withBody(response)));

        String content = _httpGet.getSomeThing("http://localhost:9191/hello");
        assertEquals(response, content);
    }

    /**
     * 用例：响应状态码为非200。
     */
    @Test
    public void testGetSomeThing4Fail() throws Exception {
        // 设置Mock
        stubFor(get(urlEqualTo("/hello"))
                .willReturn(aResponse()
                        .withStatus(500)
                        .withBody("Hello, The World!")));

        String content = _httpGet.getSomeThing("http://localhost:9191/hello");
        assertNull(content);
    }

}

参考资料

• WIreMock Getting Started
• WireMock Stubbing