AdderUsageObserver.setUsed( false );
Source source = new Source();
source.setPets( Arrays.asList( "mouse" ) );
TargetOnlyGetter target = SourceTargetMapper.INSTANCE.toTargetOnlyGetter( source );
assertThat( target ).isNotNull();
assertThat( target.getPets().size() ).isEqualTo( 1 );
assertThat( target.getPets().get( 0 ) ).isEqualTo( 2L );
assertTrue( AdderUsageObserver.isUsed() );
}