Created
September 28, 2020 06:01
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| defmodule ExChain.BlockchainTest do | |
| ... | |
| test "when we temper data in existing chain", %{ | |
| blockchain: blockchain | |
| } do | |
| blockchain = | |
| blockchain | |
| |> Blockchain.add_block("blockchain-data-block-1") | |
| |> Blockchain.add_block("blockchain-data-block-2") | |
| |> Blockchain.add_block("blockchain-data-block-3") | |
| # validate if blockchain is valid | |
| assert Blockchain.valid_chain?(blockchain) | |
| # temper the blockchain, assume at location 2 | |
| index = 2 | |
| tempered_block = put_in(Enum.at(blockchain.chain, index).data, "tempered_data") | |
| blockchain = %Blockchain{chain: List.replace_at(blockchain.chain, index, tempered_block)} | |
| # should invalidate the blockchain | |
| refute Blockchain.valid_chain?(blockchain) | |
| end | |
| test "when we temper hash in existing chain", %{ | |
| blockchain: blockchain | |
| } do | |
| blockchain = | |
| blockchain | |
| |> Blockchain.add_block("blockchain-data-block-1") | |
| |> Blockchain.add_block("blockchain-data-block-2") | |
| |> Blockchain.add_block("blockchain-data-block-3") | |
| # validate if blockchain is valid | |
| assert Blockchain.valid_chain?(blockchain) | |
| # temper the blockchain, assume at location 2 | |
| index = 2 | |
| tempered_block = put_in(Enum.at(blockchain.chain, index).hash, "tempered_hash") | |
| blockchain = %Blockchain{chain: List.replace_at(blockchain.chain, index, tempered_block)} | |
| # should invalidate the blockchain | |
| refute Blockchain.valid_chain?(blockchain) | |
| end | |
| .... | |
| end |
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