为什么在扩展AndroidTestCase的测试类中,getContext()返回null?

时间:2013-05-26 19:19:39

标签: android testing sqliteopenhelper

我有自己的SQLiteOpenHelper如下:

public class MyOpenHelper extends SQLiteOpenHelper {

  public static final int DB_VERSION = 1;
  public static final String DB_NAME = "dbname";

  public MyOpenHelper(Context context) {
    super(context, DB_NAME, null, DB_VERSION);
  }

  @Override
  public void onCreate(SQLiteDatabase sqLiteDatabase) {
    /* My create code */
  }

  @Override
  public void onUpgrade(SQLiteDatabase sqLiteDatabase, int oldVersion, int newVersion) {
    /* My upgrade code */
  }

  @Override
  public void onOpen(SQLiteDatabase db) {
    super.onOpen(db);
  }
}

我的AndroidTestCase测试类:

public class MyOpenHelperTest extends AndroidTestCase {

  protected MyOpenHelper myOpenHelper;
  protected SQLiteDatabase sqLiteDatabase;

  public MyBdOpenHelperTest() {
    super();

    assertNotNull( getContext() );

    this.myBdOpenHelper = new MyOpenHelper(getContext());
    this.sqLiteDatabase = this.myOpenHelper.getReadableDatabase();
}

然后当我执行这个测试类时,我得到了这个错误堆栈跟踪:

junit.framework.AssertionFailedError: Exception in constructor:  
testAndroidTestCaseSetupProperly (junit.framework.AssertionFailedError
at fr.power.db.MyOpenHelperTest.<init>(MyOpenHelperTest.java:21)
at java.lang.reflect.Constructor.constructNative(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:417)
at junit.runner.BaseTestRunner.getTest(BaseTestRunner.java:118)
...

为什么getContext()会返回空上下文?因为我在非活动测试案例中?

我应该在ActivityUnitTestCase中测试关于使用SQLiteOpenHelper的活动的SQLiteOpenHelper吗?

有人可以帮忙吗?我只是想测试我的SQLiteOpenHelper以确保数据库已经很好地创建。

1 个答案:

答案 0 :(得分:1)

要访问context,您可以:

  1. InstrumentationTestCase延伸,然后致电getInstrumentation().getContext()
  2. 使用反射来访问私人会员
  3. 您可以在this answer

    查看代码示例