Best Fuzz Testing Tools for Ethereum

Etheno, the Ethereum-testing Swiss Army Knife. It's a JSON RPC wrapper, analysis tool multiplexer and test integration tool. It removes the complexity in setting up analysis tools such as Echidna for large, multi-contract project. Etheno is a great tool for smart contract developers to test their contracts. Etheno is a great tool for Ethereum client developers to test their implementations. Etheno is a JSON RPC Server that can multiplex requests to one or several clients. API for filtering, modifying and filtering JSON RPC calls. Sending JSON RPC to multiple Ethereum clients allows differential testing. Deploy and interact with multiple networks simultaneously. Integration with test frameworks such as Ganache and Truffle. Run a local network test with just one command. Use our Docker container pre-built to quickly install Etheno. Etheno is a flexible tool that can be used many different ways. There are therefore a number of command-line arguments.

The hevm is a special implementation of the Ethereum Virtual Machine, which was created for the purpose of symbolic execution, unit-testing, and debugging smart contracts. It was developed by DappHub, and integrates particularly well with the DappHub toolsuite. The hevm program can run smart contracts symbolically, run unit testing, interactively debug Solidity contracts while showing their source code, or run any EVM code. Calculations can be performed by using a local test harness state or retrieved on demand from live networks via RPC calls. Run a symbolic implementation against the parameters to search for assertion violations. You can also add specific arguments to the function signature, while leaving others abstract. Hevm uses a eager approach for symbol execution, which means that it will try to explore all branches of a program first.

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Echidna is a Haskell program designed for fuzzing/property-based testing of Ethereum smart contracts. It uses sophisticated grammar based fuzzing campaigns, based on an ABI contract, to falsify user defined predicates or Solidity statements. Echidna was designed with modularity in the mind. It can be easily expanded to include new mutations, or test specific contracts for specific cases. It generates inputs that are tailored to your code. Use optional corpus collection, mutation and guidance to find deeper bugs. Powered by Slither, to extract useful information prior to the fuzzing campaigns. Source code integration for identifying which lines have been covered after the fuzzing campaign. Interactive terminal UI with text-only output or JSON. Automatic test case minimization to speed up triage. Integration into the development workflow is seamless. Reporting of maximum gas usage during the fuzzing campaign. Support for the complex contract initialization process with Etheno, Truffle.