Pi.Alert | Check the devices | Wifi library

I can think of these possible causes:

1. Have you double-checked all other possible reasons for the NullPointerException? (uninitialized api, userManager, isPhoneLoadingData etc.)
2. A null argument does not match any(String.class).
3. If there are multiple alert methods with the same parameter count, passing null can make it ambiguous. In this case, you need to cast your null arguments, e.g. (String) null.

With JUnit 5, Mockito can detect

1. method invocations that don't match the mock configuration,
2. mock configurations that are not hit by any invocations.

when you use the org.mockito.junit.jupiter.MockitoExtension.