Questions tagged [mocha]
Mocha is a JavaScript test framework for Node.js programs.
81
questions
1
vote
0answers
15 views
Cannot call method with mocha
I am running some test in my first smart contract called Inbox.sol.
I Want to call the method .message in order to see if it is equal to the default variable I use when I deploy the contract with web3....
-1
votes
1answer
40 views
SyntaxError: await is only valid in async function
I do not understand why I am having a syntax error? I am trying to run my test javascript which is available here
const assert = require('assert');
const ganache = require('ganache-cli');
const Web3 = ...
0
votes
1answer
109 views
Testing Error thrown with hardhat
How would you test the following function with solidity v0.7 and hardhat v2.3.3?
function myFunction(int8 _num) public {
require(_num > 5, "Num should be bigger than 5");
....
0
votes
1answer
12 views
Aave Flashloan `reverted with reason '73'`
I'm getting an error when attempting to execute an Aave V2 Flashloan within a Hardhat-mocha test while connected to a fork of the Kovan network. It's unclear to me what revert reason "73" ...
0
votes
0answers
13 views
How to test multiple contracts?
I have created a Ethereum dapp that has multiple contracts that access one another and use methods within each other. I would like to create a Javascript test which would emulate a use-case for this ...
0
votes
0answers
12 views
Testing a smart contract with Truffle
so I'm testing a smart contract a js framework called mocha and running the test through truffle.
require('chai')
.use(require('chai-as-promised'))
.should()
contract('Token', (accounts) => {
...
0
votes
0answers
33 views
Withdraw funds from contract
I made the following withdraw function in my smart contract:
function withdraw() public onlyOwner
{
(bool success, ) = msg.sender.call{value: address(this).balance}("");
}
I call ...
0
votes
1answer
16 views
mocha beforeEach is not running
beforeEach hook is not running. THis is a strange error, I googled but did not find anything. For anything strange, I delete node-modules and reinstall and it works but this time it did not work.
...
0
votes
1answer
31 views
Issue while testing a smart contract
Im getting myself into smartcontract development using solidity, I wrote the below smart contract and I have some issues with the Chai and Mocha test for the first function addCandidate()
//SPDX-...
0
votes
0answers
95 views
How do I write a unit test with Mocha/Waffle to see if the transaction sends the correct amount of tokens to each person?
Intro
Basically I have a contract that overrides the transfer function in IERC20.
Contract TokenA is IERC20{
function transfer(address recipient, uint256 amount) public override returns (bool) {
...
0
votes
0answers
22 views
error.message.indexOf is not a function truffle ganache
for truffle developers
var Election = artifacts.require('./Election.sol');
contract("Election",function(accounts){
var electionInstance;
it("throws an exception for double voting"...
3
votes
1answer
83 views
Test contract internal functions
I'd like to test a contract internal functions. I used to inherit the contract and test it with truffle but that involved Solidity test files.
Can I do the same with my current stack (hardhat/mocha/...
0
votes
1answer
29 views
Truffle test: Problem with understanding the test
I am trying to understand the test provided at:
Tutorial
("Test balance after deposit", function() {
return SimpleBank.deployed().then(function(instance) {
sb = instance;
...
1
vote
1answer
74 views
Perimeter of mocha, waffle and chai
Here is what i've understood (please tell me if i am wrong):
Mocha (mochajs.org) is a testing framework
Waffle (getwaffle.io) is another testing framework
chai: This is not a framework, this is a ...
0
votes
0answers
6 views
Truffle testing:How to convert from Mocha to Solidity
I am following the tutorial at:
truffle- Mocha
It shows a mocha code for testing. I want to do the testing in Solidity.
const SimpleContract = artifacts.require("SimpleContract");
contract(...
1
vote
1answer
22 views
How to resolve the issue while trying to test my contract
I'm new to blockchain development and can't figure out what I have done wrong. This is my smart contract Election :
pragma solidity ^0.5.0;
contract Election {
struct Candidate {
uint ...
0
votes
1answer
24 views
Error while testing a smart contract functionality with Mocha
I wanted to test my code functionality with the Mocha Framework, but every time it responded me with an error, not an assertion.
The specific error was:
Error:cannot find module "ganache-cli&...
0
votes
1answer
22 views
Synchronizing test and web3 enabled nodejs service
I have a test suite running in truffle, and an external web3 connected node service running - both connected to a ganache-cli network.
My problem is: my tests are supposed to pick up an event ...
0
votes
0answers
35 views
How to use Mocha reporter in Truffle console?
I work with Truffle and Windows Powershell. I set Mocha in truffle-config.js like:
module.exports = {
.
.
.
mocha: {
reporter: '...
0
votes
1answer
134 views
Solc-js: error “before each” hook for “deploys a contract”: ReferenceError: accounts is not defined
I have just started building contracts. Kindly help me in resolving this error. Attached image of error.
Lottery/contract/Lottery.sol:
pragma solidity ^0.4.17;
contract Lottery{
address public ...
0
votes
2answers
507 views
solc-js error: “before each” hook for “deploys a contract”: SyntaxError: Unexpected token u in JSON at position 0
The issue is probably here: const { interface, bytecode } = require('../compile');.
interface in the test file is undefined.
inbox/contracts/Inbox.sol:
pragma solidity ^0.7.0;
contract Inbox {
...
0
votes
1answer
144 views
Get contract's balance in js test
When getting contract's balance on Remix, it returns the correct answer.
But when the same function is called with JS Test, it returns a lot of junk.
I referred to How to get a contract's balance ...
6
votes
1answer
4k views
Error: you must provide the json interface of the contract when instantiating a contract object
That's the error that occurs when I try to test my contract.
Can someone tell me what the problem is?
That's the code for the test:
const assert = require('assert');
const fs = require('fs');
const ...
2
votes
1answer
2k views
When testing a contract, NodeJS returns: “SyntaxError: Unexpected token u in JSON at position 0”
My NodeJS script gives me this error:
1)"before each" hook for "deploy a factory and a lottery"
SyntaxError: Unexpected token u in JSON at position 0
at JSON.parse((anonymous))
at Context.(anonymous) ...
2
votes
2answers
744 views
Mocha assertions not returning correctly on assert.equal with BN
Is this an issue with deep matching/object identity?
AssertionError: expected <BN: 204fce5e3e25026110000000> to equal <BN: 204fce5e3e25026110000000>
It seems strange that chai.should ...
2
votes
1answer
361 views
Getting an 'invalid opcode' calling a solidty function from test file
im in the process of learning about ethereum and Solidity, and im having a problem calling a payable function from a test file.
This is my contract
pragma solidity >=0.4.22 <0.6.0;
//pragma ...
1
vote
0answers
350 views
Mocha timeout when running truffle test. Works fine on ganache, not on public networks
This is the error I get when running truffle test --network kovan:
1) "before all" hook: prepare suite
Error: Timeout of 120000ms exceeded. For async tests and hooks, ensure "done()" is called; if ...
1
vote
1answer
329 views
I got this error during truffle testing. AssertionError: it returns true: expected { Object (tx, receipt, …) } to equal true
DappToken.sol
function transfer(address _to, uint256 _value) public returns (bool success){
require(balanceOf[msg.sender] >= _value);
balanceOf[msg.sender] -= _value;
balanceOf[...
1
vote
2answers
538 views
How to test a custom fallback function using web3.js?
I am trying to implement a proxy pattern. I have a proxy contract and a lottery contract, and I would like the proxy contract to delegate calls to the lottery contract.
To test that the function ...
0
votes
1answer
320 views
__callback was called after the specified delay
My smart contract should return the ETH rate from Coinbase api .. So i'm using Provable engine and i'm testing my smart contract locally using ganache and ethereum-bridge .
It's expected that result ...
1
vote
2answers
258 views
Timeout w/ Mocha on deploying a contract
Starting to build the following test suite for a contract. It deploys fine on Remix.
I get the following error message.
1) "before each" hook for "deploys a contract":
Error: Timeout of 20000ms ...
0
votes
1answer
226 views
I have written a javascript code for compiling the solidity code but it's showing error
I was trying to compile my contract using solc compiler but it returning me some errors. I will place my solidity code along with the error that I am getting here. Please help me out to sort this ...
1
vote
1answer
154 views
Unable to install Mocha Web3 and Ganache-cli
I have been trying to install mocha,Web3 and ganache all through one command but I am facing an issue while installing can someone help me in sorting our this error. Quick response will be appreciated ...
1
vote
1answer
180 views
Mocha and web3.js without await [closed]
Awaiting the resolution of calls to a node works for me, like this example:
describe('some contract', async function () {
...
it('data should be written correctly', async function () {
...
3
votes
3answers
2k views
How to access in JavaScript multiple return values returned from a solidity function
My contract function returns two values. How to access the multiple return values in JavaScript from a mocha testcase?
contract X {
function a() pure public returns(uint,uint) {
uint p=10;
...
2
votes
1answer
150 views
Trying to understand why my test.js fails
I have a function that is not passing my tests in JS but the function works as expected in Remix. Can you help me
contract.sol
function test1 () public view returns(bool){
return(true);
}
...
1
vote
1answer
364 views
Solidity: How are multiple return values returned?
Working in truffle with TDD testing and am getting some errors when evaluating the return values of some functions.
If a function is returning multiple values in Solidity, how are they presented? Is ...
3
votes
3answers
641 views
Choosing between Javascript and Solidity for testing smart contracts
Truffle offers two ways to test smart contracts: either using test files written as Solidity contracts, or Javascript/Mocha.
https://truffleframework.com/docs/truffle/testing/writing-tests-in-...
0
votes
1answer
477 views
How to define a function inside a truffle contract test [closed]
Is that possible to define a function inside a truffle contract test?
There is a repetitive yet complicated step in truffle test scenario I am working on and wondering would it be possible to ...
0
votes
1answer
293 views
Testing promise in solidity [closed]
}).then(assert.fail).catch (function(error){
assert(error.message.indexOf('revert') >= 0,'msg.value must be less than tokens tokenAvaliable')
})
I have the following code in the test ...
1
vote
1answer
124 views
fromAccount and web3.js
This is my function in solidity
function transferForm(address _from, address _to, uint256 _value) public returns (bool success) {
}
Now i am calling the same function in test file for testing my ...
0
votes
1answer
652 views
Accessing Contract Variables from JS Unit Tests
I am having trouble unit testing my contracts: I am using Mocha, Chai and calling truffle test
I am testing LoanRecord.sol
contract LoanRecord {
public bool on;
...
constructor(...){
...
...
0
votes
1answer
916 views
Too many decimal places error
So I am putting together a test for my contract and this is the it() statement:
it('allows one account to enter', async () => {
await lottery.methods.enter().send({
from: accounts[0],
...
0
votes
1answer
873 views
Testing balance of a contract
I'm trying to test the balance of the contract with truffle, but I'm obviously doing something wrong as the test passes.
it("should check balance", function() {
Lottery.deployed().then(function(...
0
votes
1answer
77 views
Assert(false) not executing
I am running a mocha test for a solidity SC. One of my test function should pass and then, just after that i am calling assert(false), but it is not executing.
it('only manager can call the ...
3
votes
2answers
564 views
How can we compile multiple smart contracts by compile.js file?
My compile.js file is below
const path = require('path');
const fs = require('fs');
const solc = require('solc');
const ballotPath = path.resolve(__dirname, 'contracts', 'blocktitans_ballot.sol');
...
1
vote
1answer
170 views
Testing in solidity with npm not work correctly?
I have a problem like this. I am new to solidity development. I have created a contract like this.
pragma solidity ^0.4.17;
contract Lottery {
address public manager;
address[] public ...
0
votes
2answers
250 views
Mocha test at kill() function
How to test with Mocha and Chai that a call at the kill() function of a Smart Contract (i.e., which does the selfdestruct) has gone right?
1
vote
0answers
356 views
Mocha timeout, not resolving promise of large array from method.mymethod.call()
I'm trying to test a contract getter method that returns a large array. I am testing using the web3 library in Mocha with ganache-cli provider. My contract deploys alright, but trying to call the ...
2
votes
0answers
599 views
Truffle test - No events were emitted + TypeError: test.titlePath is not a function
1) test_initial_badge_creation
> No events were emitted
2 passing (2s)
1 failing
/usr/local/lib/node_modules/truffle/node_modules/mocha/lib/reporters/base.js:178
failures.forEach(...
