Which way to test ContentProvider is better?

[萧文翰]

I recently write a book about Jetpack(AndroidX Library), and I have some question about test ContentProvider.

I read the document below:

https://developer.android.google.cn/training/testing/integration-testing/content-provider-testing

But I found a class named ' ProviderTestRule.java', may I use this one like test Service?

As I know, there is a class named 'ServiceTestRule.java' and the document told me use this class too. 

Please refer: 

https://developer.android.google.cn/training/testing/integration-testing/service-testing

At last, I am a Chinese developer & writer, my English is not good enough. Sorry about it and I will very appreciate about your help.

Thank you!