错误模拟类，其中包含对SQLiteOpenHelper的引用

Question

我为Presenter编写了单元测试，这需要模拟 本地数据源 。

这是我的简单测试：

public class AddressPresenterTest {
    @Mock
    private AddressView mView;

    @Mock
    private AddressDataSource mDataSource;

    @Mock
    private AddressLocalDataSource mLocalDataSource;

    @Captor
    ArgumentCaptor<DataSourceCallback<Province>> mProvinceCallbackCaptor;

    private AddressPresenter mPresenter;

    @Before
    public void beforeTest() {
        MockitoAnnotations.initMocks(this);

        mPresenter = new AddressPresenter(mDataSource, mView);
        mPresenter.setLocalDataSource(mLocalDataSource);
    }

    @Test
    public void When_SelectProvince_DataIsNull_ShowErrorMessage() {
        mPresenter.getLocalProvinceById(2129023);

        // Cause data source has callback, we need to capture the callback
        ArgumentCaptor<Integer> provinceIdCaptor = ArgumentCaptor.forClass(Integer.class);
        verify(mLocalDataSource).fetchProvinceById(provinceIdCaptor.capture(), mProvinceCallbackCaptor.capture());
        mProvinceCallbackCaptor.getValue().onFailedLoad();

        verify(mView).loadContentError();
    }
}

当我运行此测试时，出现错误，

org.mockito.exceptions.base.MockitoException: 
Mockito cannot mock this class: class com.dai.uangteman.data.AddressLocalDataSource.

Mockito can only mock non-private & non-final classes.
If you're not sure why you're getting this error, please report to the mailing list.

Java               : 1.8
JVM vendor name    : Oracle Corporation
JVM vendor version : 25.77-b03
JVM name           : Java HotSpot(TM) 64-Bit Server VM
JVM version        : 1.8.0_77-b03
JVM info           : mixed mode
OS name            : Mac OS X
OS version         : 10.12.6

Underlying exception : java.lang.IllegalArgumentException: Could not create type

    at com.dai.uangteman.view.fragment.presenter.AddressPresenterTest.beforeTest(AddressPresenterTest.java:41)
...
Caused by: java.lang.IllegalArgumentException: Could not create type
    at net.bytebuddy.TypeCache.findOrInsert(TypeCache.java:140)
    ... 28 more
Caused by: java.lang.NoClassDefFoundError: android/database/sqlite/SQLiteOpenHelper
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at net.bytebuddy.TypeCache.findOrInsert(TypeCache.java:138)
    ... 45 more
Caused by: java.lang.ClassNotFoundException: android.database.sqlite.SQLiteOpenHelper
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    ... 87 more

当我解决更改AddressLocalDataSource班级的方法时，我发现有些奇怪。

public class AddressLocalDataSource {
    private StaticDatabaseHelper mDatabaseHelper;

//    /**
//     * @param mDatabaseHelper
//     */
//    public AddressLocalDataSource(StaticDatabaseHelper mDatabaseHelper) {
//        this.mDatabaseHelper = mDatabaseHelper;
//    }

    public void setDatabaseHelper(StaticDatabaseHelper mDatabaseHelper) {
        this.mDatabaseHelper = mDatabaseHelper;
    }
    ...
}

下面我发现：

1. 我尝试删除包含StaticDatabaseHelper对象参数的构造函数和setter方法，并且可以使用！
2. 我尝试StaticDatabaseHelper在setter方法中更改初始化，但这种方法无效！

问题是我AddressLocalDataSource需要StaticDatabaseHelper类的实例。

任何想法？谢谢

Answer 1

✔答案

几个小时后，我正在寻找解决方案，我得到了最简单的解决方案。我认为android库中有一些未完成的测试。所以我只是运行此gradle命令进行清理：

./gradlew clean test

现在就可以了，StaticDatabaseHelper在这种情况下，我只是模拟类。这是我的最终测试 课程 ：

public class AddressPresenterTest {

    @Mock
    private AddressView mView;

    @Mock
    private AddressDataSource mDataSource;

    @Mock
    private AddressLocalDataSource mLocalDataSource;

    @Captor
    ArgumentCaptor<DataSourceCallback<Province>> mProvinceCallbackCaptor;

    private AddressPresenter mPresenter;

    @Before
    public void beforeTest() throws Exception {
        MockitoAnnotations.initMocks(this);

        mPresenter = new AddressPresenter(mDataSource, mView);
        mPresenter.setLocalDataSource(mLocalDataSource);
    }

    @Test
    public void When_SelectProvince_DataIsNull_ShowErrorMessage() {
        mPresenter.getLocalProvinceById(2129023);

        // Cause data source has callback, we need to capture the callback
        ArgumentCaptor<Integer> provinceIdCaptor = ArgumentCaptor.forClass(Integer.class);
        verify(mLocalDataSource).fetchProvinceById(provinceIdCaptor.capture(), mProvinceCallbackCaptor.capture());
        mProvinceCallbackCaptor.getValue().onFailedLoad();

        verify(mView).loadContentError();
    }
}

希望有帮助，谢谢