Pass fork parameter to the VM in test runner, updated API in README

README.md

@@ -59,6 +59,8 @@ Creates a new VM object
   - `stateManager` - A state manager instance (**EXPERIMENTAL** - unstable API)
   - `state` - A merkle-patricia-tree instance for the state tree (ignored if `stateManager` is passed)
   - `blockchain` - A blockchain object for storing/retrieving blocks (ignored if `stateManager` is passed)
+  - `chain` - The chain the VM operates on [default: 'mainnet']
+  - `hardfork` - Hardfork rules to be used [default: 'byzantium', supported: 'byzantium']
   - `activatePrecompiles` - Create entries in the state tree for the precompiled contracts
   - `allowUnlimitedContractSize` - Allows unlimited contract sizes while debugging. By setting this to `true`, the check for contract size limit of 2KB (see [EIP-170](https://git.io/vxZkK)) is bypassed. (default: `false`; **ONLY** set to `true` during debugging).
 

tests/BlockchainTestsRunner.js

@@ -23,7 +23,8 @@ module.exports = function runBlockchainTest (options, testData, t, cb) {
   }
   var vm = new VM({
     state: state,
-    blockchain: blockchain
+    blockchain: blockchain,
+    hardfork: options.forkConfig.toLowerCase()
   })
   var genesisBlock = new Block()
 

tests/GeneralStateTestsRunner.js

@@ -51,7 +51,8 @@ function runTestCase (options, testData, t, cb) {
         VM = require('../lib/index.js')
       }
       vm = new VM({
-        state: state
+        state: state,
+        hardfork: options.forkConfig.toLowerCase()
       })
       testUtil.setupPreConditions(state, testData, done)
     },