study-univ3-on-hardhat/test/Univ3Test.ts

import {ethers, web3} from "hardhat";
import contracts from "../config/contracts";
import deployer from "../.secret";
import fee from "../config/fee";

describe('Uniswap v3 test', () => {
    let inAmount = 1e15.toString()

    it('Univ3 swap test', async () => {
        const UNIV3_ABI = require('../abi/UNIV3_ROUTER_ABI.json')

        let univ3_contract = new web3.eth.Contract(UNIV3_ABI, contracts.UNIV3)

        let rawTx = {
            from: deployer.address,
            nonce: await web3.eth.getTransactionCount(deployer.address),
            gasPrice: web3.utils.toWei('2', 'gwei'),
            gasLimit: 1_000_000
        }

        let amountIn = inAmount
        let amountOutMin = 1
        let path = [contracts.WETH, contracts.HEX]
        let to = deployer.address

        await univ3_contract.methods
            .swapExactTokensForTokens(amountIn, amountOutMin, path, to)
            .send(rawTx).then(console.log)
    })

    it('Univ3 `exactInput` test', async () => {
        const UNIV3_ABI = require('../abi/UNIV3_ROUTER_ABI.json')

        let univ3_contract = new web3.eth.Contract(UNIV3_ABI, contracts.UNIV3)

        let rawTx = {
            from: deployer.address,
            nonce: await web3.eth.getTransactionCount(deployer.address),
            gasPrice: web3.utils.toWei('2', 'gwei'),
            gasLimit: 1e6
        }

        let amountOutMin = 1
        let deadline = parseInt(String(new Date().getTime() / 1e3)) + 60
        let path = [contracts.WETH, fee._30_per_10000, contracts.USDT]
        let to = deployer.address

        let params = {
            path: ethers.utils.solidityPack(['address', 'uint24', 'address'], path),
            recipient: to,
            deadline: deadline,
            amountIn: inAmount,
            amountOutMinimum: amountOutMin
        }

        await univ3_contract.methods
            .exactInput(params)
            .send(rawTx).then(console.log)
    })

    it('Quoter calc test', async () => {
        const QUOTER_ABI = require('../abi/QUOTER_ABI.json')

        let quoter = new web3.eth.Contract(QUOTER_ABI, contracts.QUOTER)

        await quoter.methods
            .quoteExactInputSingle(contracts.WETH, contracts.USDT, fee._30_per_10000, inAmount, 0)
            .call().then(console.log)
    })

    it('Univ3 swap test', async () => {
        const FLASH_ABI = require('../artifacts/contracts/Flash.sol').abi

        let flash = new web3.eth.Contract(FLASH_ABI, contracts.FLASH)

        let rawTx = {
            from: deployer.address,
            nonce: await web3.eth.getTransactionCount(deployer.address),
            gasPrice: web3.utils.toWei('2', 'gwei'),
            gasLimit: 1e6
        }

        const WETH_USDT_POOL_CONTRACT = '0x4e68Ccd3E89f51C3074ca5072bbAC773960dFa36'
        await flash.methods
            .swap()
            .send(rawTx).then(console.log)
    })
})