Android JUnit4测试-从何处获取上下文?

问题描述：

我必须使用sqlite来构建一个应用程序.现在，我要编写单元测试.这些单元测试应该测试我的课程SQLiteBridge. SQLiteBridge为Model的每个子类提供DAO.

I have to build an app with sqlite usage. Now I want to write my unit tests. These unit tests should test my class SQLiteBridge. SQLiteBridge provides DAOs for every child class of Model.

现在我遇到一个问题，我需要一个上下文来创建我的SQLiteBridge. SQLiteBridge在系统上创建和处理SQLite数据库.

Now I got the problem that I need a context to create my SQLiteBridge. SQLiteBridge creates and handles a SQLite database on the system..

从哪里获取上下文对象?

Where to get the Context-Object from?

我的设置就像这里(所以我正在使用Junit4 [感谢上帝]): http://tools.android.com/tech-docs/unit-testing-support

My setup is like here (so I'm using Junit4 [thanks god]): http://tools.android.com/tech-docs/unit-testing-support

我希望有一种像旧版AndroidTestCase那样的扩展方式而不会丢失Junit4. :)

I hope there is a way like the old AndroidTestCase to extend without losing Junit4. :)

答

如此处所述: https ://code.google.com/p/android-test-kit/wiki/AndroidJUnitRunnerUserGuide 使用InstrumentationRegistry获取上下文.

As described here: https://code.google.com/p/android-test-kit/wiki/AndroidJUnitRunnerUserGuide Use the InstrumentationRegistry to obtain the context.

但是，如果直接调用InstrumentationRegistry.getContext()，则打开数据库可能会出现异常.我相信这是因为getContext()返回的上下文指向工具的上下文，而不是应用程序/单元测试的上下文.而是使用InstrumentationRegistry.getInstrumentation().getTargetContext()

However if you call InstrumentationRegistry.getContext() directly you may get an exception opening your database. I believe this is because the context returned by getContext() points to the instrumentation's context rather than that of your application / unit test. Instead use InstrumentationRegistry.getInstrumentation().getTargetContext()

例如:

@RunWith(AndroidJUnit4.class)
public class SqliteTest {

    Context mMockContext;

    @Before
    public void setUp() {
        mMockContext = new RenamingDelegatingContext(InstrumentationRegistry.getTargetContext(), "test_");
    }
}

RenamingDelegatingContext只是在文件/数据库名称的前面加上test_前缀，以防止您覆盖同一模拟器中可能拥有的数据.

The RenamingDelegatingContext simply prefixes the file/database names with test_ to prevent you from overwriting data that you may have in the same simulator.

Android JUnit4测试-从何处获取上下文?

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