使用 mockito 模拟 AccountManager [英] Using mockito to mock AccountManager
问题描述
我在活动测试中使用 mockito 来模拟 AccountManager.
I'm using mockito to mock AccountManager inside an Activity test.
所以,我的测试代码如下:
So, my test code is as follows:
public class PressuresListActivityUnitTest extends
ActivityUnitTestCase<PressuresListActivity> {
// Test data.
private static final String ACCOUNT_TYPE = "com.example.android";
private static final Account ACCOUNT_1 = new Account("account1@gmail.com", ACCOUNT_TYPE);
private static final Account ACCOUNT_2 = new Account("account2@gmail.com", ACCOUNT_TYPE);
private static final Account[] TWO_ACCOUNTS = { ACCOUNT_1, ACCOUNT_2 };
@Mock
private AccountManager mMockAccountManager;
public PressuresListActivityUnitTest() {
super(PressuresListActivity.class);
}
@Override
protected void setUp() throws Exception {
super.setUp();
setupDexmaker();
// Initialize mockito.
MockitoAnnotations.initMocks(this);
}
public void testAccountNotFound() {
Mockito.when(mMockAccountManager.getAccounts())
.thenReturn(TWO_ACCOUNTS);
Intent intent = new Intent(Intent.ACTION_MAIN);
startActivity(intent, null, null);
}
/**
* Workaround for Mockito and JB-MR2 incompatibility to avoid
* java.lang.IllegalArgumentException: dexcache == null
*
* @see <a href="https://code.google.com/p/dexmaker/issues/detail?id=2">
* https://code.google.com/p/dexmaker/issues/detail?id=2</a>
*/
private void setupDexmaker() {
// Explicitly set the Dexmaker cache, so tests that use mockito work
final String dexCache = getInstrumentation().getTargetContext().getCacheDir().getPath();
System.setProperty("dexmaker.dexcache", dexCache);
}
以及将要测试的活动的 onCreate 方法:
And the onCreate mthod of activity that will be tested:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_pressures_list);
AccountManager am = AccountManager.get(this);
Account[] accounts = am.getAccounts();
if (accounts.length > 0) {
Log.i("TAG", "it works!");
}
}
但是当我运行测试时,AccountManager.getAccounts 不会返回测试中指定的帐户.
But when I run the test, AccountManager.getAccounts does NOT return the accounts specified in the test.
有什么想法吗?
推荐答案
经过一番研究,终于解决了这个问题.
After some research, I finally solved the problem.
Android 提供了一些在测试中使用的类,例如 MockContext、IsolatedContext.
Android provides some classes to be used inside the tests, like MockContext, IsolatedContext.
http://developer.android.com/reference/android/测试/模拟/MockContext.html
http://developer.android.com/reference/android/test/隔离上下文.html
为了完成这项工作,我创建了 ContextWrapper 的子类并覆盖了(??) getSystemService 方法.
To get this done, I created a subclass of ContextWrapper and overrode(??) getSystemService method.
根据文档:
Context 的代理实现,只是将其所有调用委托给另一个 Context.可以子类化以修改行为,而无需更改原始 Context."
"Proxying implementation of Context that simply delegates all of its calls to another Context. Can be subclassed to modify behavior without changing the original Context."
http://developer.android.com/reference/android/content/ContextWrapper.html
通过这种方式,我使用常规 AndroidActivityUnitTestCase 在 Activity 中注入了原始上下文,但根据我的需要进行了修改.
This way, I injected the original context, but modified to fit my needs, inside the Activity using a regular AndroidActivityUnitTestCase.
看看这个:
public class FakeContextWrapper extends ContextWrapper {
private static final String ACCOUNT_TYPE = "com.example.android";
private static final Account ACCOUNT_1 = new Account("account1@gmail.com", ACCOUNT_TYPE);
private static final Account ACCOUNT_2 = new Account("account2@gmail.com", ACCOUNT_TYPE);
private static final Account[] TWO_ACCOUNTS = { ACCOUNT_1, ACCOUNT_2 };
@Mock
private AccountManager mMockAccountManager;
public FakeContextWrapper(Context base) {
super(base);
MockitoAnnotations.initMocks(this);
Mockito.when(mMockAccountManager.getAccounts()).thenReturn(TWO_ACCOUNTS);
}
@Override
public Object getSystemService(String name) {
if (Context.ACCOUNT_SERVICE.equals(name)) {
return mMockAccountManager;
} else {
return super.getSystemService(name);
}
}
}
内部测试:
public void testAccountNotFound() {
Context context = new FakeContextWrapper(getInstrumentation().getTargetContext());
setActivityContext(context);
Intent intent = new Intent(Intent.ACTION_MAIN);
startActivity(intent, null, null);
// TODO assertions.
}
最后是被测Activity:
Finally, the Activity under test:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_pressures_list);
AccountManager am = AccountManager.get(this);
Account[] accounts = am.getAccounts();
if (accounts.length == 0) {
// TODO call login.
} else {
Log.i("TAG", "it works!");
}
}
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