See https://github.com/ethereum/cpp-ethereum/blob/7cc43bed7de890a496d7238092837c30c7e90729/scripts/runalltests.sh#L38 for how cpp-ethereum uses this.

FAQ

Cannot find module

I get an error:

$ node main.js $workdir/cpp-ethereum/build/eth/eth
module.js:471
    throw err;
    ^

Error: Cannot find module '/home/yh/src/tests/RLPTests/main.js'
    at Function.Module._resolveFilename (module.js:469:15)
    at Function.Module._load (module.js:417:25)
    at Module.runMain (module.js:604:10)
    at run (bootstrap_node.js:393:7)
    at startup (bootstrap_node.js:150:9)
    at bootstrap_node.js:508:3

Answer: if your main.js is in your current directory, use ./main.js instead of just main.js.

Cannot find module web3

I get an error:

$ node ./main.js ~/src/cpp-ethereum/build/eth/eth
(node:27647) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): Error: Cannot find module 'web3'

Answer: npm install web3

Some tests fail

$ node ./main.js ~/src/cpp-ethereum/build/eth/eth
TEST_newAccount OK
TEST_addPeerOnNode2 OK
TEST_getPeerCountOnNode1 OK
TEST_mineBlockOnNode1 FAILED
TEST_mineBlockOnNode1 FAILED
TEST_getBlockHashOnNode2 OK
TEST_mineBlockOnNode2 FAILED
TEST_mineBlockOnNode2 FAILED
TEST_getBlockHashOnNode1 OK
(node:30406) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): Error: Callback was already called.

Answer: everybody experiences these failures now. They are being tracked in issue 377.

Do these failures indicate bugs in cpp-ethereum or in the test?

Different opinions exist

• ethereum#376 (comment)
• ethereum#376 (comment)

Has any other clients been tested with this?

No.