![](/img/trans.png)
[英]Mockito Unit Tests stubbing a method throws NullPointerException
[英]Android Tests: Stubbing out Retrofit with Mockito
在我的MainActivity
我有一个名为getAPI
的方法,它返回一个OTBServiceWrapper
。 这用于设置用于调用API的改进。
在我的MainActivityTest
文件中,我试图找出getApi
方法正在进行的new OTBService().getService()
调用,这样我就可以返回一个MockedOTBService
,它将客户端更改为返回json
的自定义客户端。
MockedOTBService
如果我不得不在MockedOTBService
放置一个记录器但是它也会通过并调用真正的api,那么当前的实现将是MockedOTBService
,这在测试中不是我想要的。
我试图使用Mockito存根Retrofit API调用并返回json
。 我似乎无法理解为什么存根被调用尚未存在问题的方法。
笔记:
ActivityInstrumentationTestCase2
verify(mockedOTBService, atLeastOnce()).getService();
据说它从未被称为。 when...thenReturn
使用mMainActivity = spy(getActivity())
则没有更改并且会调用真正的API。 Logcat输出
Logger﹕ MockedOTBService was called // Mock is called
Logger﹕ Real OTBService was called // Real API is called
Logger﹕ MainActivity getAPI method class is "$Proxy1" // Mock is shown in MainActivity
Logger﹕ RealAPIResponse JSON Parsed ID: 266 // Real API response returned
真正的流量
MainActivity.onCreate()> OTBService.getService()> OTBServiceWrapper.createSearch(...)
试图在测试中实现
MainActivity.onCreate()> MockedOTBService.getService()> OTBServiceWrapper.createSearch(...)
MainActivity.java
public class MainActivity extends Activity {
private OTBServiceWrapper serviceWrapper;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getApi().createSearch(...)
}
public OTBServiceWrapper getApi() {
return new OTBService().getService();
}
}
OTBService.java
public class OTBService {
public OTBServiceWrapper getService() {
RestAdapter restAdapter = new RestAdapter.Builder()
.setEndpoint(Constants.API_URL)
.build();
return restAdapter.create(OTBServiceWrapper.class);
}
}
OTBServiceWrapper.java
public interface OTBServiceWrapper {
@POST(Constants.API_SEARCHES_POST_URL)
void createSearch(@Body Request request, Callback<Request.Response> callback);
}
MainActivityTest.java
public class MainActivityTest extends ActivityInstrumentationTestCase2<MainActivity> {
private OTBService mMockedOTBService;
private MainActivity mMainActivity;
private View mSearchButton;
public MainActivityTest() { super(MainActivity.class); }
@Override
protected void setUp() throws Exception {
super.setUp();
setActivityInitialTouchMode(true);
System.setProperty("dexmaker.dexcache", getInstrumentation().getTargetContext().getCacheDir().getPath());
mMockedOTBService = mock(OTBService.class);
when(mMockedOTBService.getService()).thenReturn(new MockedOTBService(getInstrumentation().getContext()).getService());
mMainActivity = getActivity();
mSearchButton = mMainActivity.findViewById(R.id.AbSearchButton);
mYourHolidayButton = mMainActivity.findViewById(R.id.AbYourHolidayButton);
}
public void testButtonActions() {
TouchUtils.clickView(this, mSearchButton);
...
}
}
MockedOTBService.java
public class MockedOTBService {
private Context context;
public MockedOTBService(Context context) { this.context = context; }
public OTBServiceWrapper getService() {
RestAdapter restAdapter;
restAdapter = new RestAdapter.Builder()
.setClient(new LocalJsonClient(context))
.setEndpoint(Constants.API_TEST_URL)
.build();
return restAdapter.create(OTBServiceWrapper.class);
}
}
LocalJsonClient.java
@SuppressLint("DefaultLocale")
public class LocalJsonClient implements Client { ... }
的build.gradle
dependencies {
androidTestCompile 'com.google.dexmaker:dexmaker:1.0'
androidTestCompile 'com.google.dexmaker:dexmaker-mockito:1.0'
}
通过允许Activity设置服务,无需模拟您的请求。
在MainActivity
,为服务创建一个类变量和一个类设置器。 它必须是类范围,以防止在将服务设置为您希望的服务之前调用OnCreate
方法。 还要创建一个实例getter来设置服务(如果还没有)。
在您调用getActivity()
之前的测试中,将服务设置为您的模拟服务。 (也许考虑将其移到支持对象)。
MainActivity.java
public class MainActivity extends Activity {
private static OTBServiceWrapper serviceWrapper;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getServiceWrapper.createSearch(...)
}
public OTBServiceWrapper getServiceWrapper() {
if (serviceWrapper == null) {
MainActivity.setServiceWrapper(new OTBService().getService());
}
return serviceWrapper;
}
public static void setServiceWrapper(OTBServiceWrapper serviceWrapper) {
MainActivity.serviceWrapper = serviceWrapper;
}
}
MainActivityTest.java
public class MainActivityTest extends ActivityInstrumentationTestCase2<MainActivity> {
private MainActivity mMainActivity;
public MainActivityTest() { super(MainActivity.class); }
@Override
protected void setUp() throws Exception {
super.setUp();
setActivityInitialTouchMode(true);
MainActivity.setServiceWrapper(
new MockedOTBService(getInstrumentation().getContext()).getService()
);
mMainActivity = getActivity();
}
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.