Common tests for all clients to test against. See the documentation http://www.ethdocs.org/en/latest/contracts-and-transactions/ethereum-tests/index.html
Do not chagne test files in folders:
* StateTests
* BlockchainTests
* TransactionTests
* VMTests
It is being created by the testFillers which could be found at https://github.com/ethereum/cpp-ethereum/tree/develop/test/libethereum
If you want to modify a test filler or add a new test please contact @winsvega at https://gitter.im/ethereum/cpp-ethereum