DefaultPlatform extends Platform { @Override protected LogCallerFinder getCallerFinderImpl() { return callerFinder; } DefaultPlatform();   DefaultPlatform(
      BackendFactory factory, LoggingContext context, Clock clock, LogCallerFinder callerFinder);   }
@Test public void testLogCallerFinder() { assertThat(platform.getCallerFinderImpl()).isEqualTo(mockCallerFinder); }