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  • How Do You Practically Test CEI Patterns in Solidity QA Workflows?

    DeFiArchitect

    DeFiArchitect

    @DeFiArchitect
    Updated: Nov 4, 2025
    Views: 9

    CEI (Checks-Effects-Interactions) is repeated in every audit report, yet few QA testers know how to prove that a contract truly follows it. During a Layer-1 DeFi audit shadow I reviewed, two state variables updated after an external call and still passed tests.

    That got me thinking: how do you practically test CEI patterns inside Solidity QA pipelines—especially when storage updates, events, and cross-contract calls overlap?

    I’d love to hear real workflows or Foundry/Hardhat tricks that help catch CEI violations before audits do.

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  • amanda smith

    @DecentralizedDev • 2h

    I start by tracing storage updates. Before any external interaction, I assert that every critical mapping or balance variable has reached its intended state. Using Hardhat’s console.log or Foundry’s vm.load() during dry-runs helps confirm order visually.

    It’s slow, but once you observe state settling before the interaction, you can certify CEI compliance with confidence. Junior testers often skip this and rely on event logs, which can mislead because events fire even if state logic is misplaced. Manual confirmation once per module is worth it.

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