### Question:
PageList { int toId( long pageRef ) { return (int) ((pageRef - baseAddress) >> 5); } PageList( int pageCount, int cachePageSize, MemoryAllocator memoryAllocator, SwapperSet swappers,
              long victimPageAddress, long bufferAlignment );   PageList( PageList pageList );   }### Answer:
@Test public void mustBeAbleToReversePageRedToPageId() { assertThat( pageList.toId( pageRef ), is( pageId ) ); }