Truffle project encounters "Error: Cannot find deployed address"

Question

I am a beginner and was trying to run a truffle project but encountered an error which I am unfamiliar with. I based it off Testing contracts with truffle

To explain this is my folder structure.

In my app folder I have the contract C.sol and migrations.sol

In my test, I have this c.js file

In my truffle.js, this is what I have written

I ran testrpc and then tried to compile truffle and then truffle test but I got this error below saying it can't find the deployed address. What is the issue?

Answer 1

You are getting this error because you didn't deploy the contracts.You need to provide file name in truffle.js file and then need to run the command $ truffle build to build the project. Here is the related documentation : http://truffleframework.com/docs/

Answer 2

I find it's better do arrange tests so they don't attempt to work with deployed contracts. That could cause problems in the real world. I'm not 100% sure and don't have time to test, but I think Truffle will not work with the deployed contract as expected.

A lot changed from v2 to v3 so that tutorial may be a little outdated.

You can do something like this:

var c;

beforeEach(function() {
  return C.new() // deploy a new instance of C.sol before each test
  .then(function(newInstance) {
    c = newInstance;
  });
});

it("should ... 
    c.doFunction(arg1, arg2 ...) ...

You can do

$ truffle migrate

or if testrpc

$ truffle migrate --reset

when you want to deploy and truffle will help keep track of the deployed contracts with c.deployed(). Again, I don't think the migrated contracts mix with unit tests, for safety reasons.

Hope it helps.