我正在尝试使用android-room对我的DAO进行单元测试。我写了一个插入测试,可以正常工作。不幸的是,删除方法似乎无效。
我已经为测试尝试了几种不同的设置。没有一个起作用。
这是DAO:
@Dao
public interface MonthlyDao {
@Insert(onConflict = OnConflictStrategy.REPLACE)
void saveAll(List<Monthly> goals);
@Insert(onConflict = OnConflictStrategy.REPLACE)
void save(Monthly goal);
@Update
void update(Monthly goal);
@Delete
void delete(Monthly goal);
@Query("SELECT * FROM Monthly")
LiveData<List<Monthly>> findAll();
@Query("SELECT * FROM monthly")
List<Monthly> findAllList();
}
这是每月实体:
@Entity
public class Monthly {
@PrimaryKey(autoGenerate = true)
private int monthlyId;
@TypeConverters(CalendarTypeConverter.class)
@ColumnInfo(name = "date")
private Calendar date = Calendar.getInstance();
@ColumnInfo(name = "title")
private String title;
@ColumnInfo(name = "description")
private String description;
@ColumnInfo(name = "completed")
private boolean completed;
...
public int getMonthlyId() {
return monthlyId;
}
public void setMonthlyId(int monthlyId) {
this.monthlyId = monthlyId;
}
这是我正在运行的测试:
@RunWith(AndroidJUnit4.class)
public class MonthlyTest {
private MonthlyDao monthlyDao;
private MonthlyGoalsDatabase db;
@Before
public void createDb() {
Context context = ApplicationProvider.getApplicationContext();
db = Room.inMemoryDatabaseBuilder(context, MonthlyGoalsDatabase.class).build();
monthlyDao = db.getMonthlyDao();
}
@After
public void closeDb() throws IOException {
db.close();
}
@Test
public void deleteGoal() throws Exception {
String title = "test delete title";
Calendar date = Calendar.getInstance();
date.set(Calendar.HOUR_OF_DAY, 0);
String desc = "test delete desc";
Monthly goal = new Monthly(title, date, desc);
monthlyDao.save(goal);
List<Monthly> goals = monthlyDao.findAllList();
Assert.assertThat(goals.get(0).getTitle(), equalTo(goal.getTitle()));
monthlyDao.delete(goal);
List<Monthly> updatedGoals = monthlyDao.findAllList();
Assert.assertTrue(updatedGoals.isEmpty());
}
除了updatedGoals列表为空之外,我没有,但不是。我在测试过程中仍然插入了目标。
答案 0 :(得分:4)
用@Delete
注释的方法使用实体上的主键来知道要从数据库中删除哪一行(因为可能存在具有相同数据但键不同的多行)。
但是,您使用的是创建的初始goal
对象,该对象没有主键,因此不能用于指示要删除的行。
尝试这样做:
monthlyDao.save(goal);
List<Monthly> goals = monthlyDao.findAllList();
Assert.assertThat(goals.get(0).getTitle(), equalTo(goal.getTitle()));
monthlyDao.delete(goals.get(0)); // <-- Delete the goal returned from the find, which will have an ID
List<Monthly> updatedGoals = monthlyDao.findAllList();
Assert.assertTrue(updatedGoals.isEmpty());
很容易清理一点,但是上面的示例仅更改了一行,以明确问题所在。
有关文档,请参见here。