Testing smart contracts
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Public blockchains like Ethereum are immutable, making it difficult to change a smart contracts code after deployment. Contract upgrade patterns for performing "virtual upgrades" exist, but these are difficult to implement and require social consensus. Moreover, an upgrade can only fix an error after it is discovered—if an attacker discovers the vulnerability first, your smart contract is at risk of an exploit.
For these reasons, testing smart contracts before deploying to Mainnet is a minimum requirement for security. There are many techniques for testing contracts and evaluating code correctness; what you choose depends on your needs. Nevertheless, a test suite made up of different tools and approaches is ideal for catching both minor and major security flaws in contract code.
Prerequisites
This page explains how to test smart contracts before deploying on the Ethereum network. It assumes you're familiar with smart contracts.
What is smart contract testing?
Smart contract testing is the process of verifying that the code of a smart contract works as expected. Testing is useful for checking if a particular smart contract satisfies requirements for reliability, usability, and security.
Although approaches vary, most testing methods require executing a smart contract with a small sample of the data it is expected to handle. If the contract produces correct results for sample data, it is assumed to be functioning properly. Most testing tools provide resources for writing and executing test cases(opens in a new tab)