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first_steps.md

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First Steps

After installation, you are ready to use medusa on your first codebase. This chapter will walk you through initializing medusa for a project and then starting to fuzz.

To initialize medusa for a project, cd into your project and run medusa init:

# Change working directory
cd my_project

# Initialize medusa
medusa init

This will create a medusa.json file which holds a large number of configuration options. medusa will use this configuration file to determine how and what to fuzz.

All there is left to do now is to run medusa on some fuzz tests:

medusa fuzz --target-contracts "TestContract" --test-limit 10_000

The --target-contracts flag tells medusa which contracts to run fuzz tests on. You can specify more than one contract to fuzz test at once (e.g. --target-contracts "TestContract, TestOtherContract"). The --test-limit flag tells medusa to execute 10_000 transactions before stopping the fuzzing campaign.

Note: The target contracts and the test limit can also be configured via the project configuration file, which is the recommended route. The --target-contracts flag is equivalent to the fuzzing.targetContracts configuration option and the -test-limit flag is equivalent to the fuzzing.testLimit configuration option.

It is recommended to review the Configuration Overview next and learn more about medusa's CLI.