Sfl4j mock policy that injects a Mockito-created mock to be returned on calls to getLogger factory methods.
The implementation returns a single mock instance per thread but it doesn't return a different mock instance based
on the actual value passed to getLogger. This limitation is acceptable in most real uses cases.
Tests that want to do verifications on the mocked logger can do so by getting the mocked instance as production code
does:
org.slf4j.LoggerFactory.getLogger(Class). However, it is critical that the mocked logger is
reset after each test in order to avoid crosstalk between test cases.