Questions tagged [mocha]
Mocha is a JavaScript test framework for Node.js programs.
53
questions
0
votes
0answers
53 views
Error: types/values length mismatch
I'm following an Ethereum Dapp tutorial in Udemy. I seem to stumble upon an error somewhere early in the course. I was about to deploy my beginner's contract and test it with Mocha when the problem ...
0
votes
1answer
56 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
61 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 ...
0
votes
0answers
50 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 ...
0
votes
0answers
42 views
Error use account to deploy the smartcontract: Send
let accounts;
let inbox;
beforeEach(async () => {
//get a list of all accounts
accounts = await web3.eth.getAccounts();
//use one of those accounts to deploy the contract
inbox = ...
1
vote
1answer
96 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 () {
...
0
votes
2answers
219 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
47 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);
}
...
0
votes
1answer
130 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 ...
1
vote
3answers
362 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
178 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
82 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
52 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
210 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
210 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
148 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
49 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 ...
2
votes
1answer
239 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
106 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
160 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
223 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
425 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(...
3
votes
2answers
103 views
How to create more test account when using Mocha to test Solidity smart contract?
By default there are only 10 test accounts being created, how do I create more when using Mocha to test smart contract?
I assume Mocha creates a testRPC instance somehow, there must be a way to ...
-2
votes
1answer
525 views
Test in Mocha failing [closed]
I am getting the following error on running the test.
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! inbox@1.0.0 test: mocha
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the inbox@1.0....
3
votes
2answers
2k views
Solidity Exceeds block gas limit during Mocha Tests with Ganache-cli
How can I increase the gas limit in this case? The error message is "n: Exceeds block gas limit" or "base fee exceeds gas limit".
I think there is some kind of api I need to set the block gas limit ...
0
votes
1answer
334 views
Solidity Ganache/Mocha test error: base fee exceeds gas limit
I got this when I was running the Mocha test with Ganache package to test the Solidity smart contracts. Then I got base fee exceeds gas limit error. Is that because my contracts are too large? Should ...
1
vote
3answers
787 views
Using ganache-cli provider causes “Error: Provider not set or invalid”
I'm trying to write and run tests for my smart contract and I get this error: "Error: Provider not set or invalid"
Smart contract code:
const assert = require('assert');
const ganache = require('...
1
vote
0answers
103 views
Why would you use promises over async when writing JS unit tests in truffle? [closed]
I'm getting started with writing JS unit tests in the Truffle framework. I'm curious to learn when to use promises over async? On the surface, async seems a lot cleaner and easier to use for testing ...
2
votes
0answers
44 views
Configure Truffle to automatically run tests before contract deployment
How do I configure Truffle to automatically carry out all my tests before it deploys the smart contract? Ideally, it should also halt deployment in case of any test errors.
2
votes
0answers
75 views
Truffle - Stub contract functions in Mocha
How do I stub out contract functions while testing in truffle in javascript.
Normally in mocha I would import sinon and do a sinon.stub command.
It doesnt seem that I can import npm modules into the ...
8
votes
1answer
689 views
How can I debug a truffle JS unit test with vscode?
I am using visual studio code and truffle and would like to easily debug my JavaScript tests.
A similar question has been asked here: how can I run a truffle test in a debugger?. This has been ...
3
votes
1answer
258 views
How can I pass Mocha switches when calling Truffle?
When calling truffle test some_test.js, I would like to pass Mocha switches.
For example: truffle --no-colors test some_test.js works fine.
However: truffle --reporter json-streams test some_test.js ...
0
votes
1answer
178 views
Truffle test with non-standard deployment
I have a few contracts that I wanted to test using Mocha (that comes with Truffle). These contracts all require parameters in their constructor. I have modified the "2_deploy_contracts.js" file and it ...
1
vote
1answer
545 views
New Ganache (1.1.0-beta.0) Causes Invalid JSON RPC response
Hey I'm running a test where I expect a transaction to throw. Instead of successfully returning a receipt with a status of 0, or throwing a revert error, it throws this invalid JSON RPC response error....
1
vote
1answer
375 views
How do I close web3 such that mocha tests exit properly?
I'm writing a simple NodeJS (Node 9.4.0) server that's using web3 (1 beta) to interact with Ethereum.
I've created a simple utility web3 as follows:
const Web3 = require('web3')
const url = process....
1
vote
0answers
249 views
Invalid number of arguments to Solidity function when calling call from unit test
I have a problematic unit test in a suite. It's pretty simple:
it("SapienToken deployed with SPN symbol", async function() {
let SPN = await SapienToken.new(TokenController.address, Owned.address)...
5
votes
2answers
375 views
Skipping blocks when using testing with Mocha on Truffle and testrpc?
I have a contract that requires that things only happen at certain block numbers. I was wondering if there was a way to "skip" a set number of blocks?
0
votes
1answer
95 views
Where do i define the test contract params?
lets say i have this code (taken from here)
// Specifically request an abstraction for MetaCoin
var MetaCoin = artifacts.require("MetaCoin");
contract('MetaCoin', function(accounts) {
it("should put ...
1
vote
1answer
171 views
How can I get the value of an account created in mocha test?
I am new to ethereum and am using truffle and mocha for development. I am writing an app that is sending ethereum to a contract. The ether stored in the contract is then used later.
I have a function ...
1
vote
0answers
265 views
Adding payable to my contract constructor causes the contract deployment cost to be really high ~100 Ether
Here is an abstract/interface contract I created because I want to call this contract which will be deployed before my other contracts. It just holds the addresses of all the contracts I have deployed....
3
votes
2answers
498 views
unit test with truffle, solidity or mocha?
Truffle allows either one or the other. Now I wonder which I shall use to test my code. I'm not a big fan of mocha. When I see code like
contract('MetaCoin', function(accounts) { it("should put ...
2
votes
1answer
599 views
Problems with UINT values when testing with mocha/chai
I am testing at the moment some smart contracts with truffle(mocha/chai/chai-as-promised) and have the following problem:
I have a getter, and this getter delivers an UINT value, then when I try to ...
3
votes
0answers
335 views
Unit testing with chai-as-promised: how to test for two possible errors with rejectedWith()?
I am new to asking questions here and I am sorry if my question is not correctly asked!
I am currently testing some smart contracts with truffle and have some problems with testing for exceptions. ...
2
votes
1answer
541 views
Modifier causing “invalid opcode” in TestRPC
I have a token and crowdfund that works fine, except in tests. I can use all the methods, but I get invalid opcode on any of them that have a call to another contract that has a modifier on that ...
12
votes
4answers
7k views
“SyntaxError: Unexpected token import” on truffle test
I get an "SyntaxError: Unexpected token import" error when I do 'truffle test'. I am trying to import a function declared in another file into the java-script test file. I have been searching about ...
2
votes
1answer
212 views
How would one use stubs for unit testing solidity code?
Given some contract A, that depends on another contract B, what would be the best way to unit test functions from A without inadvertently testing code from B.
Normally, we could use stubs to return ...
8
votes
3answers
2k views
How to set the timeout for truffle test's before block?
I'm running my tests on a private chain and some of them times out:
1) "before all" hook:
Error: Timeout of 2000ms exceeded. For async tests and hooks, ensure "done()" is called; if returning ...
4
votes
1answer
547 views
Truffle: How to detect test environment while running smart contract test cases?
I'm trying to run some test cases in Travis CI using truffle but I want some of them not to run if the test environment(localhost:8545) is
running via "testrpc" because some of my test cases only ...
1
vote
0answers
81 views
how to use the contract instance for multiple functions?
I am trying to test the exchange where two types of tokens are trading. I want to set those tokens in exchange and trying to trade them between two accounts, but i am unable to get the updated ...
5
votes
2answers
2k views
Truffle test with async/await
Has anyone got Truffle tests to work with async/await?
My sample code for testing
require('babel-polyfill');
var ERCToken = artifacts.require("./ERCToken.sol");
var Proxy = artifacts.require("./...
