使用Mockito模拟Apache HTTPClient
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我正在尝试模拟Apache HttpClient接口,以便模拟下面提到的一个方法来返回一个存根的JSON对象作为响应。
HttpResponse response = defaultHttpClient.execute(postRequest);
有人可以通过一些示例代码建议如何实现这一目标吗?非常感谢您的帮助。
谢谢
答案
以下是我使用Mockito和Apache HttpBuilder测试代码的方法:
被测班:
import java.io.BufferedReader;
import java.io.IOException;
import javax.ws.rs.core.Response.Status;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.HttpClientBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class StatusApiClient {
private static final Logger LOG = LoggerFactory.getLogger(StatusApiClient.class);
private String targetUrl = "";
private HttpClient client = null;
HttpGet httpGet = null;
public StatusApiClient(HttpClient client, HttpGet httpGet) {
this.client = client;
this.httpGet = httpGet;
}
public StatusApiClient(String targetUrl) {
this.targetUrl = targetUrl;
this.client = HttpClientBuilder.create().build();
this.httpGet = new HttpGet(targetUrl);
}
public boolean getStatus() {
BufferedReader rd = null;
boolean status = false;
try{
LOG.debug("Requesting status: " + targetUrl);
HttpResponse response = client.execute(httpGet);
if(response.getStatusLine().getStatusCode() == Status.OK.getStatusCode()) {
LOG.debug("Is online.");
status = true;
}
} catch(Exception e) {
LOG.error("Error getting the status", e);
} finally {
if (rd != null) {
try{
rd.close();
} catch (IOException ioe) {
LOG.error("Error while closing the Buffered Reader used for reading the status", ioe);
}
}
}
return status;
}
}
测试:
import java.io.IOException;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.conn.HttpHostConnectException;
import org.junit.Assert;
import org.junit.Test;
import org.mockito.Mockito;
public class StatusApiClientTest extends Mockito {
@Test
public void should_return_true_if_the_status_api_works_properly() throws ClientProtocolException, IOException {
//given:
HttpClient httpClient = mock(HttpClient.class);
HttpGet httpGet = mock(HttpGet.class);
HttpResponse httpResponse = mock(HttpResponse.class);
StatusLine statusLine = mock(StatusLine.class);
//and:
when(statusLine.getStatusCode()).thenReturn(200);
when(httpResponse.getStatusLine()).thenReturn(statusLine);
when(httpClient.execute(httpGet)).thenReturn(httpResponse);
//and:
StatusApiClient client = new StatusApiClient(httpClient, httpGet);
//when:
boolean status = client.getStatus();
//then:
Assert.assertTrue(status);
}
@Test
public void should_return_false_if_status_api_do_not_respond() throws ClientProtocolException, IOException {
//given:
HttpClient httpClient = mock(HttpClient.class);
HttpGet httpGet = mock(HttpGet.class);
HttpResponse httpResponse = mock(HttpResponse.class);
StatusLine statusLine = mock(StatusLine.class);
//and:
when(httpClient.execute(httpGet)).thenThrow(HttpHostConnectException.class);
//and:
StatusApiClient client = new StatusApiClient(httpClient, httpGet);
//when:
boolean status = client.getStatus();
//then:
Assert.assertFalse(status);
}
}
你认为伙计们,我需要改进什么? (是的,我知道,评论。这是我从Spock背景中得到的东西:D)
另一答案
在您的单元测试类中,您需要模拟defaultHttpClient
:
@Mock
private HttpClient defaultHttpClient;
然后你告诉mockito(例如在@Before
方法中)通过以下方式实际创建你的模拟:
MockitoAnnotations.initMocks(YourTestClass);
然后在您的测试方法中定义execute()
方法应返回的内容:
when(defaultHttpClient.execute(any()/* or wahtever you want here */)).thenReturn(stubbed JSON object);
另一答案
你可以看看HttpClientMock,我为内部项目编写了它,但后来决定开源。它允许您使用流畅的API定义模拟行为,然后验证许多调用。例:
HttpClientMock httpClientMock = new
HttpClientMock("http://localhost:8080");
httpClientMock.onGet("/login?user=john").doReturnJSON("{permission:1}");
httpClientMock.verify().get("/login?user=john").called();
另一答案
您可以使用PowerMockito轻松完成此操作,PowerMockito还可以轻松地模拟最终/静态方法,私有方法和匿名类。这是模拟http请求的示例代码。 JSON_STRING_DATA是您要从execute方法获取的任何字符串。
PowerMockito.mockStatic(DefaultHttpClient.class);
HttpClient defaultHttpClientMocked = PowerMockito.mock(DefaultHttpClient.class);
PowerMockito.when(defaultHttpClientMocked.execute(Mockito.any(HttpPost.class))).thenReturn(createMockedHTTPResponse(JSON_STRING_DATA));
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