OpenZeppelin Test Helpers is a robust assertion library designed for Ethereum smart contract testing, ensuring accurate contract behavior verification. It provides essential tools to assert expected contract outcomes, such as verifying transaction reverts for specific reasons, confirming event emissions with precise values, elegantly tracking balance changes, and handling significant numerical values. The library also offers functionalities to simulate time progression. Installation is streamlined with npm, requiring additional setup for Hardhat integration. Users can seamlessly import the library in test files, leveraging utilities such as Big Number support, common constants, event assertions, and revert checks. Comprehensive documentation covers configuration and usage, with an API reference for in-depth exploration. Licensed under MIT, OpenZeppelin Test Helpers is essential for developers seeking precision and reliability in smart contract testing.