Questions tagged [chai]

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Test if a smart contract function has been called

In my hardhat project I'm testing my smart contracts using chai. For the sake of simplicity let's assume my contract is: contract MyContract { function a() external { b(); } function b() ...
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4 answers
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unit testing with chai : is there a way to simulate or force a failed transaction?

Using hardhat and chai, is there a way to simulate/force a transaction failure so the error code will execute? e.g. with the following, I want it to throw the error because the transaction didn't ...
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how to use a library with testcases using hardhat

I'm using a library for managing Events. Now when I'm running the test case script then I'm getting an error. ERROR If I don't mention the library when I'm deploying the Users.sol contract. ...
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Unit test in hardhat of SushiToken function delegatebySig

I'm playing around with contracts and trying to get the hang of it. My problem is I'm stuck with a singe function I like to unit test. I have absolutely no idea how to create an signatory in the ...
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Comparing ethers BigNumber does not work

I'm testing the value of a BigNumber returned from a function call to a contract and its not working as expected. I have this const { BigNumber } = require('ethers'); ... const totalSupply = await ...
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solidity function functionCall from openzeppelin-contracts-accounts reverted

I was calling flashLoan function using following parameters for hardhat testing expect( await this.pool.flashLoan(100, attacker.address, this.token.address, 0x00) ).to.be.not.reverted; This is ...
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Error using Merkle Tree proof in smart contract parameter in Chai

I'm trying to generate a proof from a merkle tree and enter it into the parameters of a function in a smart contract in chai. But I'm getting the follwoing error: Error: invalid arrayify value (...
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2 answers
105 views

Truffle Chai Assertion Error with Truffle Unit Cases

Problem: facing an issue with the below Truffle test case while trying to Implement the ERC20 token in my contract. contract("Token Test", async(accounts) => { const[deployerAccount, ...
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Unable to call the OZ PaymentSplitter release method from my tests

I'm using hardhat, chai to write my tests for an nft sample project im working on. Have set up the PaymentSplitter like so ... contract MyNft is ERC721A, Ownable, MerkleWhitelist, PaymentSplitter { ...
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Issue with contract redeployment while testing

I need to test a contract with hardhat. This issue is that some functions need to wait some time in order to be effective. Is there a way to tell hardhat to wait before running some functions of the ...
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Check if a function does not exist in chai

I'm using chai to test my contracts. I have a test that calls a function that does not exist in that contract. This is the contract: // SPDX-License-Identifier: MIT pragma solidity 0.8.13; import &...
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cosloe log multiple variables returned from Solidity functions

So I have a Solidity function which returns multiple values: function getReserves() external returns (uint112, uint112) { require(UniswapPair!= address(0), "Create Pair first"); ...
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Hardhat/Waffle/Chai : Display Revert Reason?

I'm testing a simple call and expect it to not revert await expect(swapCall).to.not.be.reverted The test fails currently and I get a AssertionError: Expected transaction NOT to be reverted How do I ...
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1 answer
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Convert big number to number on hardhat tests

Sorry for the newbie question. There are a lot of solutions but non of them worked for me. I am getting an account's balance with const balance_before = await ethers.provider.getBalance(redeemer....
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Smart Contract test wont passed event though the value that needed to pass to the expect block already exist

So as the title suggested i tested a smart contract (ERC721) but the the test wont pass. I am using hardhat environment for testing, that is hardhat-waffle and chai library. Here is the smart contract ...
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Hardhat/waffle: ether transfer with no effect

I'm going through the fantastic ethernaut challenges to learn solidity. In order to test and deploy my solutions I'm using hardhat/waffle/ethers. When running my contracts locally on the hardhat ...
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npm throw errors when installing dependencies of hardhat

when installing those dependencies: npm install ethers hardhat @nomiclabs/hardhat-waffle ethereum-waffle chai @nomiclabs/hardhat-ethers Those errors occurred: npm WARN deprecated ganache-core@2.13.2: ...
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How to test if msg.value is 1 ether in test

I have a function which mints when 1 eth is send to it. The function is function _mint() public payable{ require(msg.value == 1 ether , "Send more ethers: 1 ether is required"...
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2 answers
648 views

Property 'revertedWith' does not exist on type 'Assertion'

I'm running a test using waffle in hardhat. import { assert, expect } from "chai" . . . it("can only be changed through governance", async () => { await expect(box.store(...
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How to write Test case for NFT buy functionaity?

Function for buying NFT function buy(address nftContract, uint256 itemId) public payable nonReentrant { uint256 price = idToMarketItem[itemId].price; uint256 tokenId = ...
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How test uint from smartcontract with chai?

In my solidity smartcontract, I have a function to return a uint value : function getUserBalance(address userAddress, address tokenAddress) public view returns (uint256) { ...
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7 answers
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I am running my tests in the hardhat environment but it gives me 0 passing all the time

I am facing rather unusual behavior from hardhat. I have written my test cases in a file inside test folder when i run yarn teston the terminal it gives me 0 passing. Don't have any idea as to why it ...
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1 vote
2 answers
232 views

How to test a function which calls another contract from inside the function?

newToken.sol import "@openzeppelin/contracts/token/ERC1155/IERC1155Receiver.sol"; contract newToken is ERC1155 { using Counters for Counters.Counter; Counters.Counter private ...
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2 answers
541 views

Invalid Chai property when testing smart contract

In a hardhat project I'm using smock to mock an ERC20 contract and chai's calledOnce to assert: const {expect} = require("chai") const {artifacts, ethers} = require("hardhat&...
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Smart Contract Testing - ethereum-waffle expect function

Can someone please explain the significance of the location of the "await" keyword in the "expect" function from the waffle testing framework? for example: this passes (assume its ...
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Error in testing contract with javascript on truffle

I'm trying to test a contract multiple times on truffle using javascript. The first test runs just fine, but the second gives me error no matter what's inside of it. Here is my full testing code: ...
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3 votes
1 answer
102 views

Chai closeTo on Ethereum Events

I know that we can use closeTo chai matcher like this: expect(BigNumber.from(100)).to.be.closeTo(BigNumber.from(101), 10); And we can test whether a transaction emits an event with specific arguments ...
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