小编MDM*_*M82的帖子

我正在尝试使用我的SQLiteOpenHelper对象在Android Studio中针对我的应用数据库编写junit测试.每次遇到insert方法我都会得到一个NullPointerException.我在使用getContext()和我设置的mockContext之间来回走动,但没有骰子.我启动并运行了我的模拟器.有人可以告诉我我做错了什么吗？

public class LocationDatabaseHelperTest extends AndroidTestCase {

    private SQLiteDatabase testDB;
    private SQLiteDatabase readDB;
    private LocationDatabaseHelper dbh;
    private RenamingDelegatingContext mockContext;
    private ContentValues cv;



    /**
     *Sets up a mock context to initialize the
     * LocationDatabaseHelper object.
     * @throws Exception
     */
    public void setUp() throws Exception {
        super.setUp();


        final String prefix = "test";
        mockContext = new RenamingDelegatingContext(getContext(),prefix);
        dbh = new LocationDatabaseHelper(mockContext);

        try {
            testDB = dbh.getWritableDatabase();
        } catch(Exception ex){
            ex.printStackTrace();
        }

        readDB = dbh.getReadableDatabase();
        cv = new ContentValues();
    }


    /**
     *Tests that …