<分区>
我有一个名为 Pinger Service 的类，它调用一个 HttpAdapter 打开 HttpURLConnection 并返回它，然后调用 getResponseCode 来确定 URL 是否为 200。
我正在尝试模拟 HttpURLConnection 并使 getResponseCode 返回 404，但是我得到了空指针异常
测试
package com.uk.jacob.service;
import static org.junit.Assert.*;
import java.io.IOException;
import java.net.HttpURLConnection;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mock;
import org.mockito.Mockito;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.SpringApplicationConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.test.context.web.WebAppConfiguration;
import com.uk.jacob.SimplePingApplication;
import com.uk.jacob.adapter.HttpAdapter;
import com.uk.jacob.model.Website;
@RunWith(SpringJUnit4ClassRunner.class)
@SpringApplicationConfiguration(classes = SimplePingApplication.class)
@WebAppConfiguration
public class PingerServiceTests {
@Autowired
PingerService pingerService;
@Mock
HttpAdapter httpAdapter;
@Mock
HttpURLConnection mockHttpURLConnection;
@Test
public void testPingerServiceReturnsOkWhenServiceIsUp() throws IOException{
Website website = pingerService.ping("http://devnews.today");
assertEquals(true, website.ok);
}
@Test
public void testPingerServiceReturnsOkWhenServiceIsNotFound() throws IOException{
Mockito.when(mockHttpURLConnection.getResponseCode()).thenReturn(404);
Mockito.when(httpAdapter.createHttpURLConnection("http://devnews.today")).thenReturn(mockHttpURLConnection);
Website website = pingerService.ping("http://devnews.today");
assertEquals(false, website.ok);
}
@Test
public void testPingerServiceReturnsOkWhenServiceIsDown(){
Website website = pingerService.ping("https://jacob.uk.comz");
assertEquals(false, website.ok);
}
}
Pinger 服务
package com.uk.jacob.service;
import java.net.HttpURLConnection;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import com.uk.jacob.adapter.HttpAdapter;
import com.uk.jacob.model.Website;
@Component
public class PingerService {
@Autowired
HttpAdapter httpAdapter;
@Autowired
Website website;
public Website ping(String urlToPing) {
try {
HttpURLConnection connection = httpAdapter.createHttpURLConnection(urlToPing);
System.out.println(connection.getResponseCode());
if(connection.getResponseCode() == 200){
website.ok = true;
}
} catch (Exception e) {
website.ok = false;
}
return website;
}
}
HTTP适配器
package com.uk.jacob.adapter;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;
import org.springframework.stereotype.Component;
@Component
public class HttpAdapter {
public HttpURLConnection createHttpURLConnection(String urlToPing) throws IOException{
URL url = new URL(urlToPing);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
connection.connect();
return connection;
}
}
故障轨迹
java.lang.NullPointerException
at com.uk.jacob.service.PingerServiceTests.testPingerServiceReturnsOkWhenServiceIsNotFound(PingerServiceTests.java:44)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:254)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:89)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:193)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)