Problem running test from truffle develop

[eggplantzzz]

Issue

truffle test fails when run from truffle develop

Steps to Reproduce

1. In a new directory, run truffle unbox metacoin
2. After unboxing, run truffle develop
3. When the prompt appears, run test

Expected Behavior

I expect the tests to run

Actual Results

TypeError [ERR_INVALID_REPL_INPUT]: Listeners for `uncaughtException` cannot be used in the REPL
    at process.<anonymous> (repl.js:224:15)
    at process.emit (events.js:215:7)
    at process.emit (/Users/tyler/.nvm/versions/node/v12.11.0/lib/node_modules/truffle/build/webpack:/~/source-map-support/source-map-support.js:465:1)
    at _addListener (events.js:236:14)
    at process.addListener (events.js:284:10)
    at Runner.run (/Users/tyler/.nvm/versions/node/v12.11.0/lib/node_modules/truffle/node_modules/mocha/lib/runner.js:868:11)
    at Mocha.run (/Users/tyler/.nvm/versions/node/v12.11.0/lib/node_modules/truffle/node_modules/mocha/lib/mocha.js:612:17)
    at /Users/tyler/.nvm/versions/node/v12.11.0/lib/node_modules/truffle/build/webpack:/packages/core/lib/test.js:116:1
    at new Promise (<anonymous>)
    at Object.run (/Users/tyler/.nvm/versions/node/v12.11.0/lib/node_modules/truffle/build/webpack:/packages/core/lib/test.js:115:1)

Environment

• Operating System: Mac OS
• Ethereum client: truffle develop
• Truffle version (truffle version): 5.0.40
• node version (node --version): 12
• npm version (npm --version): 6

[eggplantzzz]

This bug is specific to Node 12 and is present in 5.0.39 and 5.0.38.

[eggplantzzz]

Looks like it was referenced by David Burela here #2070

[ghost]

hello there, im having the same issue with Truffle v5.1.28, same behavior, just clarify the bug is present not only in 5.0.38 and 5.0.39.

Just made a fresh instalation following those steps, all works fine but the test command :) https://www.trufflesuite.com/boxes/drizzle

bests :)

---

carlos@carlos-linux-machine:~/desarrollo/sc1-ethereum-rinkeby/app$ truffle version
Truffle v5.1.28 (core: 5.1.28)
Solidity v0.5.16 (solc-js)
Node v12.18.0
Web3.js v1.2.1

---

`truffle(develop)> test
Using network 'develop'.

Compiling your contracts...

Compiling ./test/TestSimpleStorage.sol
Artifacts written to /tmp/test-202059-9170-1ypjpj2.6mm6
Compiled successfully using:

• solc: 0.5.16+commit.9c3226ce.Emscripten.clang

TypeError [ERR_INVALID_REPL_INPUT]: Listeners for uncaughtException cannot be used in the REPL
at process. (repl.js:256:15)
at process.emit (events.js:327:22)
at process.emit (/usr/local/lib/node_modules/truffle/build/webpack:/node_modules/source-map-support/source-map-support.js:495:1)
at processEmit (/usr/local/lib/node_modules/truffle/build/webpack:/node_modules/signal-exit/index.js:155:1)
at process.emit (/usr/local/lib/node_modules/truffle/build/webpack:/node_modules/reselect-tree/node_modules/source-map-support/source-map-support.js:485:1)
at _addListener (events.js:358:14)
at process.addListener (events.js:406:10)
at Runner.run (/usr/local/lib/node_modules/truffle/node_modules/mocha/lib/runner.js:868:11)
at Mocha.run (/usr/local/lib/node_modules/truffle/node_modules/mocha/lib/mocha.js:612:17)
at /usr/local/lib/node_modules/truffle/build/webpack:/packages/core/lib/test.js:159:1
at new Promise ()
at Object.run (/usr/local/lib/node_modules/truffle/build/webpack:/packages/core/lib/test.js:158:1)
at processTicksAndRejections (internal/process/task_queues.js:97:5)
truffle(develop)>`

[fainashalts]

I just tested this in Truffle v5.1.31 and truffle test does work in this newest version. @eggplantzzz or @spore-engineering can you confirm? Thanks!

[CruzMolina]

@fainashalts did you make sure to test using Node 12?

Running the test command within truffle develop using Node versions >= 12.3.0 should fail and throw the reported error.

[fainashalts]

@CruzMolina I thought I had changed my node version but turns out it was still running v10. You are right, this error does happen on >= 12.3.0! Sorry for the confusion!

[CruzMolina]

Directly related to mochajs/mocha#4009.

Would love more beta testers of our experimental release! #2070 (comment):

Hey everyone! ✋

We just published an experimental prerelease that uses a fork of mocha with one tiny change. 🤞

Our node 12 CI appears to be pleased and smoke testing locally w/ node 12 LTS seems to be fine.

Please give it a try and let us know if things work!

npm un -g truffle
npm i -g truffle@nodeLTS

[eggplantzzz]

Linking this PR because it may fix this issue. #3146

[CruzMolina]

Unfortunately, #3146 does not resolve this issue ☹️ #3146 (review)

[Yeleboh]

Hi Guys,

am running these versions and am getting the above error.

Truffle v5.1.35 (core: 5.1.35)
Solidity v0.5.16 (solc-js)
Node v12.18.2
Web3.js v1.2.1

Any recommendations?

[Yeleboh]

See!!

[fainashalts]

@Yeleboh we have been working on a fix for this and I'm hoping it will be in this week's release! I'll post here with an update once that is the case. Thanks!

[Yeleboh]

@fainashalts Thank you Faina for your reply. I look forward to this fix. However, if I reverted to earlier version of truffle, could this be a temporary fix until this week's release is out?

[eggplantzzz]

@Yeleboh If you downgrade Node to version 10 it should work.

[rafarodra]

@fainashalts Please please tell us when this is s updated. I'm having the same issue.

[haltman-at]

OK, this should be fixed now!