When writing tests in Truffle, is it possible to force specific wallet addresses to be used?

Question

I have Solidity code that, given the input of the sender's wallet address, deterministically produces a resulting output.

My goal is to write a unit test for this functionality. Is there a way I can override the msg.sender value?

I'm using Truffle 4.0.4 alongside testrpc.

Answer 1

One way to achieve that would be to run testrpc always using the same mnemonic which will always generate the same accounts.

You can do that by doing testrpc -m "word1 word2 word3 word..."