anchor.diff:  
       UpdatedBlock = ?BLOCK(20, 43),
       FinalBlocks = [lists:nth(1, TestBlocks), UpdatedBlock, lists:nth(7, TestBlocks)],
  +    ?assertEqual(FinalBlocks, fslogic_blocks:merge(TestBlocks, InputBlocks)),
       check_overlapping_blocks_update(InputBlocks, BlocksToChange, [UpdatedBlock], FinalBlocks).
   
   
  
positive.code:     Input1 = lists:sublist(InputBlocks, 2) ++ lists:sublist(InputBlocks, 4, 2),
      UpdatedBlocks = [?BLOCK(20, 23), ?BLOCK(50, 23)],
      FinalBlocks = [lists:nth(1, TestBlocks)] ++ UpdatedBlocks ++ [lists:nth(8, TestBlocks)],
      check_overlapping_blocks_update(Input1, BlocksToChange, UpdatedBlocks, FinalBlocks),
  
      Input2 = [lists:nth(3, InputBlocks)],
      UpdatedBlock = ?BLOCK(20, 53),
      FinalBlocks2 = [lists:nth(1, TestBlocks), UpdatedBlock, lists:nth(8, TestBlocks)],
      check_overlapping_blocks_update(Input2, UpdatedBlocks, [UpdatedBlock],
          FinalBlocks2, [UpdatedBlock], BlocksToChange).
  
  
negative.code:     Input1 = lists:sublist(InputBlocks, 2),
      UpdatedBlock1 = ?BLOCK(20, 23),
      FinalBlocks = [lists:nth(1, TestBlocks), UpdatedBlock1] ++ lists:sublist(TestBlocks, 5, 4),
      ?assertEqual(FinalBlocks, fslogic_blocks:merge(TestBlocks, Input1)),
      ExpectedGetResult = lists:sublist(BlocksToChange, 3),
      check_overlapping_blocks_update(Input1, ExpectedGetResult, [UpdatedBlock1], FinalBlocks),
  
      Input2 = lists:sublist(InputBlocks, 4, 2),
      UpdatedBlock2 = ?BLOCK(50, 23),
      FinalBlocks2 = [lists:nth(1, TestBlocks), UpdatedBlock1, UpdatedBlock2, lists:nth(8, TestBlocks)],
      ?assertEqual(FinalBlocks2, fslogic_blocks:merge(FinalBlocks, Input2)),
      check_overlapping_blocks_update(Input2, lists:sublist(BlocksToChange, 4, 3), [UpdatedBlock2],
          FinalBlocks2, [UpdatedBlock1, UpdatedBlock2], BlocksToChange),
  
      Input3 = [lists:nth(3, InputBlocks)],
      UpdatedBlock3 = ?BLOCK(20, 53),
      FinalBlocks3 = [lists:nth(1, TestBlocks), UpdatedBlock3, lists:nth(8, TestBlocks)],
      ?assertEqual(FinalBlocks3, fslogic_blocks:merge(FinalBlocks2, Input3)),
      check_overlapping_blocks_update(Input3, [UpdatedBlock1, UpdatedBlock2], [UpdatedBlock3],
          FinalBlocks3, [UpdatedBlock3], BlocksToChange).
  
  