使用 PowerMock 模拟私有方法

Question

我正在尝试测试下一个方法：

public void methodToTest() {
    // Other stuff
    privateMethod(false).execute(new Void[0]);
}

正在调用 privateMethod:

private AsyncTask<Void, Void, CustomObject> privateMethod(final boolean renew) {
    AsyncTask<Void, Void, CustomObject> asyncTask = new AsyncTask<Void, Void, CustomObject>() {

        @Override
        protected CustomObject doInBackground(Void... params) {
            CustomObject custom = new CustomObject();

            return custom;
        }
        protected void onPostExecute(CustomObject custom) {
            //some code
        }
    };

无法在使用 Mockito 的测试中执行 asyncTask，因此我需要以某种方式模拟它。我试过用 PowerMock 模拟私有方法：

@Mock Context mockContext;
@Mock AsyncTask<Void, Void, CustomObject> mockAsyncTask;

@Test
public void methodTest() {
    ClassToTest objectToTest = new ClassToTest(mockContext);
    try {
        PowerMockito.doReturn(mockAsyncTask).when(objectToTest, "privateMethod", ArgumentMatchers.anyBoolean());
    objectToTest.methodToTest();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

这在 PowerMockito 行 (NullPointerException) 中给了我一个异常

Method threw 'org.mockito.exceptions.misusing.UnfinishedStubbingException' exception. Cannot evaluate android.os.AsyncTask$MockitoMock52591544.toString()

现在我运行不知道如何模拟这个对象。

Answer 1

终于找到答案了：

@Test
public void methodTest() {
    ClassToTest objectToTest = PowerMockito.spy(new ClassToTest());
    try {
        when(objectToTest, method(ClassToTest.class, "privateMethod", boolean.class)).withArguments(false).thenReturn(mockAsyncTask);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

并且就在 class 声明之前：

@PrepareForTest(ClassToTest.class)

使用 PowerMock 模拟私有方法

Mocking private method with PowerMock

java

android

unit-testing

mockito

powermockito