[Ethereum] How to test contract with multiple accounts / addresses in truffle

addressessoliditytruffletruffle-test

I want to test my truffle contract with multiple msg.sender addresses. Like "the first user sell token, the second user buys this token". For one address I simply write something like contract.buy.value(10 wei)();. But where I could get another address and how to send money from him?

I write my tests on solidity, not on javascript.

Best Answer

Yes you can, do your test in Javascript.

In your test you can initialize it like this:

const MyContract = artifacts.require('MyContract');

contract('MyContract', accounts => {
  const owner = accounts[0];
  const alice = accounts[1];
  const bob = accounts[2];

  it('should do something', async () => {
    const contract = await MyContract.deployed();
    await contract.buy(price, data, { from: alice });
    await contract.buy(price, data, { from: bob });
    assert.equal(...);
  });
});

Notice the accounts variable. Hope this helps.

Related Solutions

Truffle – How to Expose Accounts in Truffle Projects

In the truffle console you can access them with web3.eth.getBalance(web3.eth.accounts[0]), just replace the zero.

In a Javascript file you can easily access them as showed in the basic metacoin test:

var MetaCoin = artifacts.require("./MetaCoin.sol");

contract('MetaCoin', function(accounts) {
  it("should put 10000 MetaCoin in the first account", function() {
    return MetaCoin.deployed().then(function(instance) {
      return instance.getBalance.call(accounts[0]);
    }).then(function(balance) {
      assert.equal(balance.valueOf(), 10000, "10000 wasn't in the first account");
    });
  });
});

In principle the contract doesn't know on which network it's deployed, therefore I'm not sure that you can do it from within the solidity contract.

[Ethereum] Testing transfer of tokens with truffle

The problem was with the constructor:

constructor() public{
   mytoken  = MyToken(DeployedAddresses.MyToken());

}

Should be:

constructor() public{
   mytoken  = new MyToken();

}

Thanks to @dwarfu over at ConsenSys gitter who found the solution.

Best Answer

Related Solutions

Truffle – How to Expose Accounts in Truffle Projects

[Ethereum] Testing transfer of tokens with truffle

Related Topic