Fuzz Testing
Fuzz testing (fuzzing) is the automated process of providing random, semi-random, or mutated inputs to software in order to trigger unexpected behavior, crashes, or security vulnerabilities.
In Depth
Fuzz testing, commonly called fuzzing, is a software testing technique that has become essential in smart contract security. By automating the generation of test inputs, fuzz testing can explore far more scenarios than manual testing. In the smart contract context, fuzz testing generates random sequences of function calls with random parameters to find state violations, arithmetic errors, access control bypasses, and other vulnerabilities. Modern fuzz testing tools for smart contracts include Echidna, Medusa, and Foundry's built-in fuzzer.
Frequently Asked Questions
What is fuzz testing?
Fuzz testing is an automated testing technique that feeds random or semi-random inputs to a program to find bugs. In smart contract security, it generates random transaction sequences to find vulnerabilities that manual testing misses.
How do I start fuzz testing my smart contracts?
The easiest way to start is with Recon's VS Code extension, which scaffolds a fuzzing setup in one click. You can also use Recon Pro to run fuzz tests in the cloud. For manual setup, choose a fuzzer (Echidna, Medusa, or Foundry) and write property tests.