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If the chain of the miner B grows faster than the chain of the miner A, then the transaction A will never be accepted (like it never happened). The transaction A is still unconfirmed in the mempool for any nodes following the best chain building on miner B's block. Any subsequent block is free to include it. The best chain has only one block at each height. ...


Those consensus rules are indeed the same for testnet and mainnet. However, they do only apply when scripts are executed. So you have to create an input trying to spend it to test this.

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