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VM tests
========
VM tests test one instance of EVM (which contains one stack of 256-bit words, and one memory space).
Operations accessing the world state should be tested in GeneralStateTests or BlockchainTests instead of in VM tests.
So VM tests should not contain
* `BALANCE`
* `CREATE`
* `CREATE2`
* `CALL`
* `CALLCODE`
* `STATICCALL`
* `DELEGATECALL`
* `EXTCODESIZE`
* `EXTCODECOPY`
* `BLOCKHASH`
Previously, some VM tests contained these, and clients were supposed to implement some mock of the world state (especially, the block hash of a block is supposed to be the hash of the block number).
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