- 'value' => serialize(array_merge($existing_blocks, ['block.block.testfor2354889', 'block.block.secondtestfor2354889', 'block.block.thirdtestfor2354889']))
+ 'value' => serialize(array_merge($existing_blocks, ['block.block.testfor2354889', 'block.block.secondtestfor2354889', 'block.block.thirdtestfor2354889'])),