Here my test js file

const ApprovalContract = artifacts.require('../../contracts/ApprovalContract.sol');

contract('ApprovalContract' function (accounts) {

    it('initiates contract', async function() {
        const contract = await ApprovalContract.deployed();
        const approver = await contract.approver.call();
        assert.equal(approver, 0x3999BA5D247c800E5Ef3d4de66618741E3675379, "approver don't match");

From my cmd

  • What is the content of your configuration file (truffle.js and/or truffle-config.js)? Are you testing against ganache or a private network? The error message is saying your truffle configuration id doesn't matches the id returned by the network.
    – Ismael
    Apr 4, 2019 at 19:22
  • I testing against truffle/ganache network, and I have both 2 file, truffle.js and truffle-config.js in different location. The truffle-config.js file was just an example file when i "truffle init" and below is my truffle.js file code. module.exports = { networks: { development: { host: "", port: 9545, network_id: "*" } } }; truffle-config.js location: D:\Desktop\BuildDapps 2\contracts truffle.js location: D:\Desktop\BuildDapps 2\contracts\test
    – sohd9
    Apr 5, 2019 at 13:46
  • I think the configuration file has to be in D:\Desktop\BuildDapps 2`, and you should execute truffle commands from that directory. You only need one config file in your proyect, either truffle-config.js` or truffle.js.
    – Ismael
    Apr 5, 2019 at 17:20

3 Answers 3


I encountered the same thing when running truffle test.

The reason is likely because truffle-config.js from truffle unbox <package> have network information commented out.

Thus, the port and network_id default to 4447, which is what truffle test defaults to if nothing is specified in truffle-config.js

See: https://github.com/trufflesuite/truffle/pull/1577/files

What you will need to do is to uncomment the networks config in truffle-config.js.

module.exports = {
  /* <- NOTE: need to uncomment this!
  networks: {
    development: {
      host: "",
      port: 7545,
      network_id: "*"
    test: {
      host: "",
      port: 7545,
      network_id: "*"
  */ <- NOTE: need to uncomment this!


delete file truffle.js

file truffle-config.js module.exports = { networks: { development: { host: "", port: 7545, network_id: "*" } } };


In my case, i did not specify the truffle-config.js in Gananche.

Go to the setting and add correct truffle-config.js

enter image description here

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