Best Fuzz Testing Tools for Solidity

Solidity Fuzzing boilerplate is a repository of templates designed to make it easier to fuzze components in Solidity projects. This includes libraries. Write your tests once and use them for both Echidna's and Foundry’s fuzzing. Etheno can be used to deploy components that are incompatible Solidity versions into a Ganache instance. Use HEVM’s FFI cheat codes to generate complex fuzzing outputs or to compare the outputs with non EVM executables when doing differential fuzzing. You can publish your fuzzing experiment without worrying about licensing if you extend the shell script to include specific files. If you do not intend to use shell commands in your Solidity contracts, turn off FFI. FFI is a slow solution and should only ever be used as a temporary workaround. It can be used to test against things that are hard to implement in Solidity but already exist in other programming languages. Be sure to check the commands being executed before executing tests on a project with FFI enabled.

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.