我發現了很多類似的問題,但都沒有完全回答我的問題。 在android中單元測試SQLliteOpenHelper類的最佳方式是什麼?測試SQLiteOpenHelper類時上下文null null
我的錯誤:
java.lang.NullPointerException: Attempt to invoke virtual method 'boolean
android.content.Context.deleteDatabase(java.lang.String)' on a null object reference
at android.test.RenamingDelegatingContext.openOrCreateDatabase(RenamingDelegatingContext.java:157)
at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:223)
at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:163)
at uk.co.ticking_clock.reptilekeeper.data.AnimalOperationsTest.pet_defaultEntries(AnimalOperationsTest.java:36)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
代碼:
@RunWith(AndroidJUnit4.class)
public class DatabaseOperationsTest extends AndroidTestCase {
private MyDbHelper testDb;
@Before
public void setUp() throws Exception {
super.setUp();
RenamingDelegatingContext context = new RenamingDelegatingContext(getContext(), "test_");
testDb = MyDbHelper.getInstance(context);
}
@After
public void tearDown() {
testDb = null;
}
@Test
public void pet_defaultEntries() {
SQLiteDatabase db = testDb.getWritableDatabase();
Cursor textDb = db.rawQuery("SELECT name FROM tableOne", null);
int expected = 2;
int actual = textDb.getCount();
Assert.assertTrue(expected == actual);
}
}
你的錯誤來自'deleteDatabase()'調用。在你的問題的代碼中沒有'deleteDatabase()'調用。請發佈整個Java堆棧跟蹤,以及該堆棧跟蹤中引用的您的源代碼。另外,'AndroidTestCase'可能不適用於'@RunWith(AndroidJUnit4.class)',並且在任何情況下都被棄用。使用'InstrumentationRegistry.getTargetContext()'獲取正在測試的應用程序或庫代碼的'Context'。 – CommonsWare
已添加擴展堆棧跟蹤 –