Questions tagged [mocha]
Mocha is a JavaScript test framework for Node.js programs.
86
questions
0
votes
0answers
39 views
How to write Test case for Internal functions in solidity which inherits the ERC721
**This is my Smart Contract code which has inherited the ERC721 and I want to write the test case for _setTokenURI **
contract ProductNFT is ERC721 {
constructor () public ERC721(_tokenName,...
1
vote
1answer
28 views
How to test ether value in truffle test script using Mocha and chai
I'm having a method inside my contract which return a variable having value is 100 ether for example. E.g:
uint256 private baseline
constructor() {
baseline = 100 ether;
}
function getBaseline() ...
0
votes
2answers
62 views
How to write test case for the require function
**Contract**
contract ProductNFT is ERC721{
uint public totalSupply;
address public wadmin;
address public brand;
address public designer;
...
0
votes
1answer
200 views
Is it possible to send ether to a contract after deployment inside a hardhat test?
This is using Hardhat with ethers.js:
My test wants to deploy a contract and then I want to send ether to it:
const { ethers } = require("hardhat");
describe("HandleEther contract",...
1
vote
1answer
202 views
Use contract from outside contract folder in hardhat test
When I try to import a contract from other artifacts folders or node modules into the dapp test using
this.LinkToken = await ethers.getContractFactory('@chainlink/contracts/src/v0.4/LinkToken.sol')
...
0
votes
1answer
12 views
Unit testing does not fail when I add 1 to the variables to be equated to
Just started with unit testing after creating my token, but the test cases are passing even if I add a number in the equals bracket.
In test one, if I change to expect(await instance.balanceOf(...
2
votes
1answer
26 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
95 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
773 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
22 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
1answer
24 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
16 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) => {
...
1
vote
0answers
42 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
70 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
37 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
197 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
32 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
174 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
40 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
114 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
8 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
24 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
39 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
25 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
1answer
158 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
697 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
211 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
6k 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
1k 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
406 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
396 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
420 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
610 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
355 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
287 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
259 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
172 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
196 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 () {
...
4
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
178 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
404 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
669 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
519 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
318 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
135 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
761 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
1k 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
1k 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
86 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 ...
