Blockchain Tests¶

Basic structure¶

{
   "ValidBlocks": {
           "genesisBlockHeader": { ... },
           "pre": { ... },
           "blocks" : [
                   {
                           "chainname" : "A",
                           "blocknumber" : "1",
                           "rlp": { ... },
                           "blockHeader": { ... },
                           "transactions": { ... },
                           "uncleHeaders": { ... }
                   },
                   {
                           "chainname" : "A",
                           "blocknumber" : "2",
                           "rlp": { ... },
                           "blockHeader": { ... },
                           "transactions": { ... },
                           "uncleHeaders": { ... }
                   }
           ]
   },
   "SomeInvalidBlocks": {
           "genesisBlockHeader": { ... },
           "pre": { ... },
           "blocks" : [
                   {
                           "chainname" : "B",
                           "blocknumber" : "3",
                           "chainnetwork" : "Frontier",
                           "rlp": { ... },
                   },
                   {
                           "blocknumber" : "1",
                           "rlp": { ... },
                           "blockHeader": { ... },
                           "transactions": { ... },
                           "uncleHeaders": { ... }
                   },
                   {
                           "blocknumber" : "1",
                           "chainnetwork" : "Homestead",
                           "rlp": { ... },
                   },
                   {
                           "blocknumber" : "2",
                           "rlp": { ... },
                           "blockHeader": { ... },
                           "transactions": { ... },
                           "uncleHeaders": { ... }
                   }
           ]
   },
   ...
}

Sections¶

• The genesisBlockHeader section

coinbase:

The 160-bit address to which all fees collected from the successful mining of this block be transferred, as returned by the COINBASE instruction.

difficulty:

A scalar value corresponding to the difficulty level of this block. This can be alculated from the previous block’s difficulty level and the timestamp, as returned by the DIFFICULTY instruction.

gasLimit:

A scalar value equal to the current limit of gas expenditure per block, as returned by the GASLIMIT instruction.

number:

A scalar value equal to the number of ancestor blocks. The genesis block has a number of zero.

timestamp:

A scalar value equal to the reasonable output of Unix’s time() at this block’s inception, as returned by the TIMESTAMP instruction.

parentHash:

The Keccak 256-bit hash of the parent block’s header, in its entirety

bloom:

The Bloom filter composed from indexable information (logger address and log topics) contained in each log entry from the receipt of each transaction in the transactions list.

extraData:

An arbitrary byte array containing data relevant to this block. This must be 1024 bytes or fewer.

gasUsed:

A scalar value equal to the total gas used in transactions in this block.

nonce:

A 256-bit hash which proves that a sufficient amount of computation has been carried out on this block.

receiptTrie:

The Keccak 256-bit hash of the root node of the trie structure populated with the receipts of each transaction in the transactions list portion of the block.

stateRoot:

The Keccak 256-bit hash of the root node of the state trie, after all transactions are executed and finalisations applied.

transactionsTrie:

The Keccak 256-bit hash of the root node of the trie structure populated with each transaction in the transactions list portion of the block.

uncleHash:

The Keccak 256-bit hash of the uncles list portion of this block

• pre section: as described in State Tests.
• postState section: as described in State Tests (section - post).
• blocks section is a list of block objects, which have the following format:
• rlp section contains the complete rlp of the new block as described in the yellow paper in section 4.3.3.
• blockHeader section describes the block header of the new block in the same format as described in genesisBlockHeader.
• transactions section is a list of transactions which have the same format as in Transaction Tests.
• uncleHeaders section is a list of block headers which have the same format as descibed in genesisBlockHeader.

Optional BlockHeader Sections (Information fields)¶

"blocknumber" = "int" is section which defines what is the order of this block. It is used to define a situation when you have 3 blocks already imported but then it comes new version of the block 2 and 3 and thus you might have new best blockchain with blocks 1 2’ 3’ instead previous. If blocknumber is undefined then it is assumed that blocks are imported one by one. When running test, this field could be used for information purpose only.

"chainname" = "string" This is used for defining forks in the same test. You could mine blocks to chain “A”: 1, 2, 3 then to chain “B”: 1, 2, 3, 4 (chainB becomes primary). Then again to chain “A”: 4, 5, 6 (chainA becomes primary) and so on. chainname could also be defined in uncle header section. If defined in uncle header it tells on which chain’s block uncle header would be populated from. When running test, this field could be used for information purpose only.

"chainnetwork" = "string" Defines on which network rules this block was mined. (see the difference https://github.com/ethereum/EIPs/blob/master/EIPS/eip-2.mediawiki). When running test, this field could be used for information purpose only.