Tag: web3

Fork testing smart contracts runs your tests on a copy of mainnet state. Learn when it helps, when it gives false confidence, and how to pin the block.

How to write a reentrancy test in Solidity with Foundry. Build the attacker contract, watch the test fail, then apply checks-effects-interactions and a guard.

Six Solidity unit test patterns with Foundry code: revert, event, access control, rounding, fuzz and state-transition tests, plus the bug each one catches.

The edge cases that break NFT contracts: stale approvals, mint limits, reentrancy, royalties, metadata and ownership, with Hardhat tests for each.

Build realistic DeFi test data: fee-on-transfer, rebasing and blacklistable token mocks, forked mainnet state and failure scenarios, with Hardhat code.

Use gas ceilings, gas reports and snapshot tests to find and lock in gas savings in smart contracts, with measured Hardhat examples.

How to test upgradeable contracts: storage layout checks, proxy upgrade simulation, initializer tests, gas checks and a pre-upgrade checklist.

Set up automated smart contract tests with Hardhat and ethers v6, run them in GitHub Actions on every push, and add gas, fuzz and fork tests.

Budget for web3 testing: audits, QA salaries, infrastructure and gas, with sourced ranges and a sample annual budget for a mid-sized project.

How to test the contract-to-frontend flow in a dapp: a local Hardhat chain, an injected wallet provider, Playwright tests and a CI run, with a DEX swap example.

Web3 testing differs from web2 in environment, state, async behavior, security, performance and auth. Practical fixes for each, with Hardhat examples.