Truffle: Truffle - test: Cannot create property 'negative' on number '1'

[flockonus]

Issue

There seems to be some terrible bugs on the current big number implementation, and it's breaking tests.

Steps to Reproduce

My case was during a test, but i can also do it using truffle develop with a simpler case:

>  n = new web3.utils.BN('1'); n.sub('1')

/workspace/node_modules/truffle/build/cli.bundled.js:1315
      num.negative = 0;
                   ^

TypeError: Cannot create property 'negative' on string '1'

Seems to be some crazy internal error. Possible reference

Expected Behavior

Not an internal error

Environment

• Operating System: MacOS
• Ethereum client: ?
• Truffle version (truffle version): 5.0.12
• node version (node --version): v11.4.0
• npm version (npm --version):

[eggplantzzz]

@flockonus Thanks for the heads up! We'll keep this in mind and follow the BN issue that you linked above.

[flockonus]

Thanks @eggplantzzz , the workaround I'm using currently is to cast the string also into BN.
Example:

n = new web3.utils.BN('1'); n.sub(web3.utils.toBN('1'))

[CruzMolina]

Hey @flockonus , turns ou that BN does not take strings for those methods! Your workaround is the way to do it, you can also use n.subn(1).

[CruzMolina]

Closing since there's nothing we can do on our end about this.

[saikrishnakalangi]

I am facing the same issue but i did not get a solution

[gnidan]

@saikrishnakalangi did you follow the syntax here?