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In smart contract development, thorough testing is essential to prevent costly vulnerabilities. Utilize testnets like Goerli, Sepolia, or Devnet to simulate real-world conditions. Development frameworks such as Hardhat, Truffle, Anchor, or Foundry streamline the process. Implement unit tests, integration tests, and simulate potential attack vectors to ensure robustness. Perform internal audits and consider using bug bounty platforms to uncover hidden issues. Optimize contracts for gas efficiency and apply formal verification to critical functions for mathematical assurance. A rigorous testing approach is crucial for secure and reliable smart contract deployment.