android - Espresso : How can I test that the activity finished with result RESULT_OK?

Question

在我的应用程序中，当用户单击“注册”按钮时，将启动 RegisterActivity。用户填写表单后，详细信息将发布到 Web 服务，如果注册成功，RegisterActivity 将以 RESULT_OK 结束。下面的代码示例总结了这一点:

public void submitRegistration() {

    showProgressDialog(R.string.registration, R.string.please_wait);  
    
    getWebApi().register(buildRegistrationFromUI(), new Callback<ApiResponse>() {

        @Override
        public void success(ApiResponse apiResponse, Response response) {     
            hideProgressDialog();
            setResult(RESULT_OK);
            finish();
        }

        @Override
        public void failure(RetrofitError error) {
            hideProgressDialog();
            showErrorDialog(ApiError.parse(error));
        }
    });
}

使用 Espresso，我如何检查 Activity 是否已通过 setResult(RESULT_OK) 完成？

请注意:我不想要创建模拟 Intent 。我想检查意向结果状态。

Answer 1

setResult(...) 方法所做的只是更改 Activity 类中字段的值

 public final void setResult(int resultCode, Intent data) {
    synchronized (this) {
        mResultCode = resultCode;
        mResultData = data;
    }
}

因此我们可以使用 Java 反射访问 mResultCode 字段来测试该值是否确实已设置为 RESULT_OK。

@Rule
public ActivityTestRule<ContactsActivity> mActivityRule = new ActivityTestRule<>(
        ContactsActivity.class);


@Test
public void testResultOk() throws NoSuchFieldException, IllegalAccessException {
    Field f = Activity.class.getDeclaredField("mResultCode"); //NoSuchFieldException
    f.setAccessible(true);
    int mResultCode = f.getInt(mActivityRule.getActivity());

    assertTrue("The result code is not ok. ", mResultCode == Activity.RESULT_OK);
}